2-benzylpyridazinone derivatives as met kinase inhibitors

ABSTRACT

Compounds of the formula I 
                         
in which R 1 , R 2 , R 3 , R 4′  have the meanings indicated in claim  1 , are inhibitors of tyrosine kinases, in particular Met kinase, and can be employed, inter alia, for the treatment of tumors.

BACKGROUND OF THE INVENTION

The invention had the object of finding novel compounds having valuable properties, in particular those which can be used for the preparation of medicaments.

The present invention relates to compounds and to the use of compounds in which the inhibition, regulation and/or modulation of signal transduction by kinases, in particular tyrosine kinases and/or serine/threonine kinases, plays a role, furthermore to pharmaceutical compositions which comprise these compounds, and to the use of the compounds for the treatment of kinase-induced diseases.

In particular, the present invention relates to compounds and to the use of compounds in which the inhibition, regulation and/or modulation of signal transduction by Met kinase plays a role.

One of the principal mechanisms by which cellular regulation is effected is through the transduction of extracellular signals across the membrane that in turn modulate biochemical pathways within the cell. Protein phosphorylation represents one course by which intracellular signals are propagated from molecule to molecule resulting finally in a cellular response. These signal transduction cascades are highly regulated and often overlap, as is evident from the existence of many protein kinases as well as phosphatases. Phosphorylation of proteins occurs predominantly at serine, threonine or tyrosine residues, and protein kinases have therefore been classified by their specificity of phosphorylation site, i.e. serine/threonine kinases and tyrosine kinases. Since phosphorylation is such a ubiquitous process within cells and since cellular phenotypes are largely influenced by the activity of these pathways, it is currently believed that a number of disease states and/or diseases are attributable to either aberrant activation or functional mutations in the molecular components of kinase cascades. Consequently, considerable attention has been devoted to the characterisation of these proteins and compounds that are able to modulate their activity (for a review see: Weinstein-Oppenheimer et al. Pharma. &. Therap., 2000, 88, 229-279).

The role of the receptor tyrosine kinase Met in human oncogenesis and the possibility of inhibition of HGF (hepatocyte growth factor)dependent Met activation are described by S. Berthou et al. in Oncogene, Vol. 23, No. 31, pages 5387-5393 (2004). The inhibitor SU11274 described therein, a pyrrole-indoline compound, is potentially suitable for combating cancer. Another Met kinase inhibitor for cancer therapy is described by J. G. Christensen et al. in Cancer Res. 2003, 63(21), 7345-55.

A further tyrosine kinase inhibitor for combating cancer is reported by H. Hov et al. in Clinical Cancer Research Vol. 10, 6686-6694 (2004). The compound PHA-665752, an indole derivative, is directed against the HGF receptor c-Met. It is furthermore reported therein that HGF and Met make a considerable contribution to the malignant process of various forms of cancer, such as, for example, multiple myeloma.

The synthesis of small compounds which specifically inhibit, regulate and/or modulate signal transduction by tyrosine kinases and/or serine/threonine kinases, in particular Met kinase, is therefore desirable and an aim of the present invention.

It has been found that the compounds according to the invention and salts thereof have very valuable pharmacological properties while being well tolerated.

The present invention specifically relates to compounds of the formula I which inhibit, regulate and/or modulate signal transduction by Met kinase, to compositions which comprise these compounds, and to processes for the use thereof for the treatment of Met kinase-induced diseases and complaints, such as angiogenesis, cancer, tumor formation, growth and propagation, arteriosclerosis, ocular diseases, such as age-induced macular degeneration, choroidal neovascularisation and diabetic retinopathy, inflammatory diseases, arthritis, thrombosis, fibrosis, glomerulonephritis, neurodegeneration, psoriasis, restenosis, wound healing, transplant rejection, metabolic diseases and diseases of the immune system, also autoimmune diseases, cirrhosis, diabetes and diseases of the blood vessels, also instability and permeability and the like in mammals.

Solid tumors, in particular fast-growing tumors, can be treated with Met kinase inhibitors. These solid tumors include monocytic leukaemia, brain, urogenital, lymphatic system, stomach, laryngeal and lung carcinoma, including lung adenocarcinoma and small-cell lung carcinoma.

The present invention is directed to processes for the regulation, modulation or inhibition of Met kinase for the prevention and/or treatment of diseases in connection with unregulated or disturbed Met kinase activity. In particular, the compounds of the formula I can also be employed in the treatment of certain forms of cancer. The compounds of the formula I can furthermore be used to provide additive or synergistic effects in certain existing cancer chemotherapies, and/or can be used to restore the efficacy of certain existing cancer chemotherapies and radiotherapies.

The compounds of the formula I can furthermore be used for the isolation and investigation of the activity or expression of Met kinase. In addition, they are particularly suitable for use in diagnostic methods for diseases in connection with unregulated or disturbed Met kinase activity.

It can be shown that the compounds according to the invention have an antiproliferative action in vivo in a xenotransplant tumor model. The compounds according to the invention are administered to a patient having a hyperproliferative disease, for example to inhibit tumor growth, to reduce inflammation associated with a lymphoproliferative disease, to inhibit transplant rejection or neurological damage due to tissue repair, etc. The present compounds are suitable for prophylactic or therapeutic purposes. As used herein, the term “treatment” is used to refer to both prevention of diseases and treatment of pre-existing conditions. The prevention of proliferation is achieved by administration of the compounds according to the invention prior to the development of overt disease, for example to prevent the growth of tumors, prevent metastatic growth, diminish restenosis associated with cardiovascular surgery, etc. Alternatively, the compounds are used for the treatment of ongoing diseases by stabilising or improving the clinical symptoms of the patient.

The host or patient can belong to any mammalian species, for example a primate species, particularly humans; rodents, including mice, rats and hamsters; rabbits; horses, cows, dogs, cats, etc. Animal models are of interest for experimental investigations, providing a model for treatment of human disease.

The susceptibility of a particular cell to treatment with the compounds according to the invention can be determined by in vitro tests. Typically, a culture of the cell is combined with a compound according to the invention at various concentrations for a period of time which is sufficient to allow the active agents to induce cell death or to inhibit migration, usually between about one hour and one week. In vitro testing can be carried out using cultivated cells from a biopsy sample. The viable cells remaining after the treatment are then counted.

The dose varies depending on the specific compound used, the specific disease, the patient status, etc. A therapeutic dose is typically sufficient considerably to reduce the undesired cell population in the target tissue while the viability of the patient is maintained. The treatment is generally continued until a considerable reduction has occurred, for example an at least about 50% reduction in the cell burden, and may be continued until essentially no more undesired cells are detected in the body.

For identification of a signal transduction pathway and for detection of interactions between various signal transduction pathways, various scientists have developed suitable models or model systems, for example cell culture models (for example Khwaja et al., EMBO, 1997, 16, 2783-93) and models of transgenic animals (for example White et al., Oncogene, 2001, 20, 7064-7072). For the determination of certain stages in the signal transduction cascade, interacting compounds can be utilised in order to modulate the signal (for example Stephens et al., Biochemical J., 2000, 351, 95-105). The compounds according to the invention can also be used as reagents for, testing kinase-dependent signal transduction pathways in animals and/or cell culture models or in the clinical diseases mentioned in this application.

Measurement of the kinase activity is a technique which is well known to the person skilled in the art. Generic test systems for the determination of the kinase activity using substrates, for example histone (for example Alessi et al., FEBS Lett. 1996, 399, 3, pages 333-338) or the basic myelin protein, are described in the literature (for example Campos-Gonzalez, R. and Glenney, Jr, J. R. 1992, J. Biol. Chem. 267, page 14535).

For the identification of kinase inhibitors, various assay systems are available. In scintillation proximity assay (Sorg et al., J. of Biomolecular Screening, 2002, 7, 11-19) and flashplate assay, the radioactive phosphorylation of a protein or peptide as substrate with γATP is measured. In the presence of an inhibitory compound, a decreased radioactive signal, or none at all, is detectable. Furthermore, homogeneous time-resolved fluorescence resonance energy transfer (HTR-FRET) and fluorescence polarisation (FP) technologies are suitable as assay methods (Sills et al., J. of Biomolecular Screening, 2002, 191-214).

Other non-radioactive ELISA assay methods use specific phospho-antibodies (phospho-ABs). The phospho-AB binds only the phosphorylated substrate. This binding can be detected by chemiluminescence using a second peroxidase-conjugated anti-sheep antibody (Ross et al., 2002, Biochem. J.).

There are many diseases associated with deregulation of cellular proliferation and cell death (apoptosis). The conditions of interest include, but are not limited to, the following. The compounds according to the invention are suitable for the treatment of various conditions where there is proliferation and/or migration of smooth muscle cells and/or inflammatory cells into the intimal layer of a vessel, resulting in restricted blood flow through that vessel, for example in the case of neointimal occlusive lesions. Occlusive graft vascular diseases of interest include atherosclerosis, coronary vascular disease after grafting, vein graft stenosis, peri-anastomatic prosthetic restenosis, restenosis after angioplasty or stent placement, and the like.

PRIOR ART

Other pyridazine derivatives are described as MET kinase inhibitors in WO 2007/065518.

Thiadiazinones are described in DE19604388, WO2003/037349 WO2007/057093 or WO2007/057092.

Dihydropyridazinones for combating cancer are described in WO 03/037349 A1.

Other pyridazines for the treatment of diseases of the immune system, ischaemic and inflammatory diseases are known from EP 1 043 317 A1 and EP 1 061 077 A1.

EP 0 738 716 A2 and EP 0 711 759 B1 describe other dihydropyridazinones and pyridazinones as fungicides and insecticides.

Other pyridazinones are described as cardiotonic agents in U.S. Pat. No. 4,397,854. JP 57-95964 discloses other pyridazinones.

SUMMARY OF THE INVENTION

The invention relates to compounds of the formula I

in which

-   -   R¹ denotes H or A,     -   R² denotes an unsaturated, saturated or aromatic 5- or         6-membered heterocycle having 1 to 4 N, O and/or S atoms, which         may be unsubstituted or mono-, di- or trisubstituted by Hal, A,         [C(R³)₂]_(n)OR³, N═CR³N(R³)₂, SR³, NO₂, CN, COOR³, CON(R³)₂,         NR³COA, NR³SO₂A, SO₂N(R³)₂, S(O)_(m)A, [C(R³)₂]_(n)N(R³)₂,         [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂, O[C(R³)₂]_(n)Het,         S[C(R³)₂]_(n)N(R³)₂, S[C(R³)₂]_(n)Het, NR³[C(R³)₂]_(n)N(R³)₂,         NR³[C(R³)₂]_(n)Het, NHCON(R³)₂, NHCONH[C(R³)₂]_(n)N(R³)₂,         NHCONH[C(R³)₂]_(n)Het, [C(R³)₂]_(n)NHCO[C(R³)₂]_(n)N(R³)₂,         [C(R³)₂]_(n)NHCO[C(R³)₂]_(n)Het, CON(R³)₂,         CONR³[C(R³)₂]_(n)N(R³)₂, CONR³[C(R³)₂]_(n)NR³COOA,         CONR³[C(R³)₂]_(n)OR³, CONR³[C(R³)₂]_(n)Het, COHet, COA and/or ═O         (carbonyl oxygen),     -   R³ denotes H or A,     -   R⁴, R^(4′) each, independently of one another, denote H, Hal, A,         OR³, CN, COOR³, CON(R³)₂, NR³COA, NR³SO₂A, SO₂N(R³)₂ or         S(O)_(m)A,     -   Ar denotes phenyl, naphthyl or biphenyl, each of which is         unsubstituted or mono-, di- or trisubstituted by Hal, A,         [C(R³)₂]_(n)OR³, [C(R³)₂]_(n)N(R³)₂, SR³, NO₂, CN, COOR³,         CON(R³)₂, NR³COA, NR³SO₂A, SO₂N(R³)₂, S(O)_(m)A, CO-Het, Het,         O[C(R³)₂]_(n)N(R³)₂, O[C(R³)₂]_(n)Het, NHCOOA, NHCON(R³)₂,         NHCOO[C(R³)₂]_(n)N(R³)₂, NHCOO[C(R³)₂]_(n)Het,         NHCONH[C(R³)₂]_(n)N(R³)₂, NHCONH[C(R³)₂]_(n)Het,         OCONH[C(R³)₂]_(n)N(R³)₂, OCONH[C(R³)₂]_(n)Het,         CONR³[C(R³)₂]_(n)N(R³)₂, CONR³[C(R³)₂]_(n)Het and/or COA,     -   Het denotes a mono-, bi- or tricyclic saturated, unsaturated or         aromatic heterocycle having 1 to 4 N, O and/or S atoms, which         may be unsubstituted or mono-, di- or trisubstituted by Hal, A,         [C(R³)₂]_(n)OR³, [C(R³)₂]_(n)N(R³)₂, SR³, NO₂, CN, COOR³,         CON(R³)₂, NR³COA, NR³SO₂A, SO₂N(R³)₂, S(O)_(m)A, CO-Het¹,         [C(R³)₂]_(n)Het¹, O[C(R³)₂]_(n)N(R³)₂, O[C(R³)₂]_(n)Het¹,         NHCOOA, NHCON(R³)₂, NHCOO[C(R³)₂]_(n)N(R³)₂,         NHCOO[C(R³)₂]_(n)Het¹, NHCONH[C(R³)₂]_(n)N(R³)₂,         NHCONH[C(R³)₂]_(n)Het¹, OCONH[C(R³)₂]_(n)N(R³)₂,         OCONH[C(R³)₂]_(n)Het¹, CO-Het¹, CHO, COA, ═S, ═NH, ═NA and/or ═O         (carbonyl oxygen),     -   Het¹ denotes a monocyclic saturated heterocycle having 1 to 2 N         and/or O atoms, which may be mono- or disubstituted by A, OA,         OH, Hal and/or ═O (carbonyl oxygen),     -   A denotes unbranched or branched alkyl having 1-10 C atoms, in         which 1-7 H atoms may be replaced by F and/or in which one or         two non-adjacent CH₂ groups may be replaced by O, NH, S, SO, SO₂         and/or by CH═CH groups,         -   or         -   cyclic alkyl having 3-7 C atoms,     -   Hal denotes F, Cl, Br or I,     -   m denotes 0, 1 or 2,     -   n denotes 0, 1, 2, 3 or 4,         and pharmaceutically usable salts, tautomers and stereoisomers         thereof, including mixtures thereof in all ratios.

The compounds of the formula I are also taken to mean pharmaceutically usable derivatives and solvates thereof.

The invention also relates to the optically active forms (stereoisomers), the enantiomers, the racemates, the diastereomers and the hydrates and solvates of these compounds. The term solvates of the compounds is taken to mean adductions of inert solvent molecules onto the compounds which form owing to their mutual attractive force solvates are, for example, mono- or dihydrates or alkoxides.

The term pharmaceutically usable derivatives is taken to mean, for example, the salts of the compounds according to the invention and also so-called prodrug compounds.

The term prodrug derivatives is taken to mean compounds of the formula I which have been modified by means of, for example, alkyl or acyl groups, sugars or oligopeptides and which are rapidly cleaved in the organism to form the effective compounds according to the invention.

These also include biodegradable polymer derivatives of the compounds according to the invention, as described, for example, in Int. J. Pharm. 115, 61-67 (1995).

The expression “effective amount” denotes the amount of a medicament or of a pharmaceutical active ingredient which causes in a tissue, system, animal or human a biological or medical response which is sought or desired, for example, by a researcher or physician.

In addition, the expression “therapeutically effective amount” denotes an amount which, compared with a corresponding subject who has not received this amount, has the following consequence: improved treatment, healing, prevention or elimination of a disease, syndrome, condition, complaint, disorder or side-effects or also the reduction in the advance of a disease, complaint or disorder.

The expression “therapeutically effective amount” also encompasses the amounts which are effective for increasing normal physiological function.

The invention also relates to the use of mixtures of the compounds of the formula I, for example mixtures of two diastereomers, for example in the ratio 1:1, 1:2, 1:3, 1:4, 1:5, 1:10, 1:100 or 1:1000.

These are particularly preferably mixtures of stereoisomeric compounds.

The invention relates to the compounds of the formula I and salts thereof and to a process for the preparation of compounds of the formula I according to claims 1-10 and pharmaceutically usable salts, tautomers and stereoisomers thereof, characterised in that

-   -   a) a compound of the formula II

in which R¹ has the meaning indicated in claim 1, is reacted with a compound of the formula III

in which R², R³, R⁴ and R^(4′) have the meanings indicated in claim 1 and L denotes Cl, Br, I or a free or reactively functionally modified OH group, or

-   -   b) a radical R² is converted into another radical R² by     -   i) arylating a heterocycle,     -   ii) acylating or alkylating an amino group,     -   iii) etherifying a hydroxyl group,         or     -   c) it is liberated from one of its functional derivatives by         treatment with a solvolysing or hydrogenolysing agent,         and/or         a base or acid of the formula I is converted into one of its         salts.

Above and below, the radicals R¹, R², R³, R⁴, R^(4′) have the meanings indicated for the formula I, unless expressly stated otherwise.

A denotes alkyl, this is unbranched (linear) or branched, and has 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 C atoms. A preferably denotes methyl, furthermore ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl or tert-butyl, furthermore also pentyl, 1-, 2- or 3-methylbutyl, 1,1-, 1,2- or 2,2-dimethyipropyl, 1-ethyl-propyl, hexyl, 1-, 2-, 3- or 4-methylpentyl, 1,1-, 1,2-, 1,3-, 2,2-, 2,3- or 3,3-dimethylbutyl, 1- or 2-ethylbutyl, 1-ethyl-1-methylpropyl, 1-ethyl-2-methylpropyl, 1,1,2- or 1,2,2-trimethylpropyl, furthermore preferably, for example, trifluoromethyl.

A very particularly preferably denotes alkyl having 1, 2, 3, 4, 5 or 6 C atoms, preferably methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, trifluoromethyl, pentafluoroethyl or 1,1,1-trifluoro-ethyl.

Cyclic alkyl (cycloalkyl) preferably denotes cyclopropyl, cyclobutyl, cyclo-pentyl, cyclohexyl or cycloheptyl.

Ar denotes, for example, o-, m- or p-tolyl, o-, m- or p-ethylphenyl, o-, m- or p-propylphenyl, o-, m- or p-isopropylphenyl, o-, m- or p-tert-butylphenyl, o-, m- or p-hydroxyphenyl, o-, m- or p-nitrophenyl, o-, m- or p-aminophenyl, o-, m- or p-(N-methylamino)phenyl, o-, m- or p-(N-methylaminocarbonyl)-phenyl, o-, m- or p-acetamidophenyl, o-, m- or p-methoxyphenyl, m- or p-ethoxyphenyl, o-, m- or p-ethoxycarbonylphenyl, o-, m- or p-(N,N-dimethylamino)phenyl, o-, m- or p-(N,N-dimethylaminocarbonyl)phenyl, o-, m- or p-(N-ethylamino)phenyl, o-, m- or p-(N,N-diethylamino)phenyl, o-, m- or p-fluorophenyl, o-, m- or p-bromophenyl, o-, m- or p-chlorophenyl, m- or p-(methylsulfonamido)phenyl, o-, m- or p-(methylsulfonyl)phenyl, o-, m- or p-methylsulfanylphenyl, o-, m- or p-cyanophenyl, o-, m- or p-carboxy-phenyl, o-, m- or p-methoxycarbonylphenyl, o-, m- or p-formylphenyl, o-, m- or p-acetylphenyl, o-, m- or p-aminosulfonylphenyl, o-, m- or p-(morpholin-4-ylcarbonyl)phenyl, o-, m- or p-(morpholin-4-ylcarbonyl)phenyl, o-, m- or p-(3-oxomorpholin-4-yl)phenyl, o-, m- or p-(piperidinylcarbonyl)phenyl, o-, m- or p-[2-(morpholin-4-yl)ethoxy]phenyl, o-, m- or p-[3-(N,N-diethyl-amino)propoxy]phenyl, o-, m- or p-[3-(3-diethylaminopropyl)ureido]phenyl, o-, m- or p-(3-diethylaminopropoxycarbonylamino)phenyl, furthermore preferably 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-difluorophenyl, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-dichlorophenyl, 2,3-, 2,4-, 2,5-, 2,6-, 3,4- or 3,5-dibromo-phenyl, 2,4- or 2,5-dinitrophenyl, 2,5- or 3,4-dimethoxyphenyl, 3-nitro-4-chlorophenyl, 3-amino-4-chloro-, 2-amino-3-chloro-, 2-amino-4-chloro-, 2-amino-5-chloro- or 2-amino-6-chlorophenyl, 2-nitro-4-N,N-dimethyl-amino- or 3-nitro-4-N,N-dimethylaminophenyl, 2,3-diaminophenyl, 2,3,4-, 2,3,5-, 2,3,6-, 2,4,6- or 3,4,5-trichlorophenyl, 2,4,6-trimethoxyphenyl, 2-hydroxy-3,5-dichlorophenyl, p-iodophenyl, 3,6-dichloro-4-aminophenyl, 4-fluoro-3-chlorophenyl, 2-fluoro-4-bromophenyl, 2,5-difluoro-4-bromo-phenyl, 3-bromo-6-methoxyphenyl, 3-chloro-6-methoxyphenyl, 3-chloro-4-acetamidophenyl, 3-fluoro-4-methoxyphenyl, 3-amino-6-methylphenyl, 3-chloro-4-acetamidophenyl or 2,5-dimethyl-4-chlorophenyl.

Ar furthermore preferably denotes phenyl, naphthyl or biphenyl, each of which is unsubstituted or mono-, di- or trisubstituted by Hal, CN, O[C(R³)₂]_(n)N(R³)₂, CONR³[C(R³)₂]_(n)N(R³)₂ and/or CONR³[C(R³)₂]_(n)Het.

Irrespective of further substitutions, Het denotes, for example, 2- or 3-furyl, 2- or 3-thienyl, 1-, 2- or 3-pyrrolyl, 1-, 2, 4- or 5-imidazolyl, 1-, 3-, 4- or 5-pyrazolyl, 2-, 4- or 5-oxazolyl, 3-, 4- or 5-isoxazolyl, 2-, 4- or 5-thiazolyl, 3-, 4- or 5-isothiazolyl, 2-, 3- or 4-pyridyl, 2-, 4-, 5- or 6-pyrimidinyl, furthermore preferably 1,2,3-triazol-1-, -4- or -5-yl, 1,2,4-triazol-1-, -3- or 5-yl, 1- or 5-tetrazolyl, 1,2,3-oxadiazol-4- or -5-yl, 1,2,4-oxadiazol-3- or -5-yl, 1,3,4-thiadiazol-2- or -5-yl, 1,2,4-thiadiazol-3- or -5-yl, 1,2,3-thiadiazol-4- or -5-yl, 3- or 4-pyridazinyl, pyrazinyl, 1-, 2-, 3-, 4-, 5-, 6- or 7-indolyl, 4- or 5-iso-indolyl, indazolyl, 1-, 2-, 4- or 5-benzimidazolyl, 1-, 3-, 4-, 5-, 6- or 7-benzo-pyrazolyl, 2-, 4-, 5-, 6- or 7-benzoxazolyl, 3-, 4-, 5-, 6- or 7-benzisoxazolyl, 2-, 4-, 5-, 6- or 7-benzothiazolyl, 2-, 4-, 5-, 6- or 7-benzisothiazolyl, 4-, 5-, 6- or 7-benz-2,1,3-oxadiazolyl, 2-, 3-, 4-, 5-, 6-, 7- or 8-quinolyl, 1-, 3-, 4-, 5-, 6-, 7- or 8-isoquinolyl, 3-, 4-, 5-, 6-, 7- or 8-cinnolinyl, 2-, 4-, 5-, 6-, 7- or 8-quinazolinyl, 5- or 6-quinoxalinyl, 2-, 3-, 5-, 6-, 7- or 8-2H-benzo-1,4-oxazinyl, further preferably 1,3-benzodioxol-5-yl, 1,4-benzodioxan-6-yl, 2,1,3-benzothiadiazol-4-, -5-yl or 2,1,3-benzoxadiazol-5-yl or dibenzo-furanyl.

The heterocyclic radicals may also be partially or fully hydrogenated.

Irrespective of further substitutions, Het can thus also denote, for example, 2,3-dihydro-2-, -3-, -4- or -5-furyl, 2,5-dihydro-2-, -3-, -4- or 5-furyl, tetra-hydro-2- or -3-furyl, 1,3-dioxolan-4-yl, tetrahydro-2- or -3-thienyl, 2,3-dihydro-1-, -2-, -3-, -4- or -5-pyrrolyl, 2,5-dihydro-1-, -2-, -3-, -4- or -5-pyrrolyl, 1-, 2- or 3-pyrrolidinyl, tetrahydro-1-, -2- or -4-imidazolyl, 2,3-dihydro-1-, -2-, -3-, -4- or -5-pyrazolyl, tetrahydro-1-, -3- or -4-pyrazolyl, 1,4-dihydro-1-, -2-, -3- or -4-pyridyl, 1,2,3,4-tetrahydro-1-, -2-, -3-, -4-, -5- or -6-pyridyl, 1-, 2-, 3- or 4-piperidinyl, 2-, 3- or 4-morpholinyl, tetrahydro-2-, -3- or -4-pyranyl, 1,4-dioxanyl, 1,3-dioxan-2-, -4- or -5-yl, hexahydro-1-, -3- or -4-pyridazinyl, hexahydro-1-, -2-, -4- or -5-pyrimidinyl, 1-, 2- or 3-piperazinyl, 1,2,3,4-tetrahydro-1-, -2-, -3-, -4-, -5-, -6-, -7- or -8-quinolyl, 1,2,3,4-tetra-hydro-1-, -2-, -3-, -4-, -5-, -6-, -7- or -8-isoquinolyl, 2-, 3-, 5-, 6-, 7- or 8-3,4-dihydro-2H-benzo-1,4-oxazinyl, furthermore preferably 2,3-methylene-dioxyphenyl, 3,4-methylenedioxyphenyl, 2,3-ethylenedioxyphenyl, 3,4-ethylenedioxyphenyl, 3,4-(difluoromethylenedioxy)phenyl, 2,3-dihydro-benzofuran-5- or 6-yl, 2,3-(2-oxomethylenedioxy)phenyl or also 3,4-dihydro-2H-1,5-benzodioxepin-6- or -7-yl, furthermore preferably 2,3-dihydrobenzofuranyl, 2,3-dihydro-2-oxofuranyl, 3,4-dihydro-2-oxo-1H-quinazolinyl, 2,3-dihydrobenzoxazolyl, 2-oxo-2,3-dihydrobenzoxazolyl, 2,3-dihydrobenzimidazolyl, 1,3-dihydroindole, 2-oxo-1,3-dihydroindole or 2-oxo-2,3-dihydrobenzimidazolyl.

Het preferably denotes a monocyclic saturated, unsaturated or aromatic heterocycle having 1 to 4 N, O and/or S atoms, which may be unsubstituted or mono-, di- or trisubstituted by A and/or [C(R³)₂]_(n)Het¹.

Het particularly preferably denotes piperidinyl, piperazinyl, pyrrolidinyl, morpholinyl, furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl, thiadiazolyl, pyridazinyl or pyrazinyl, each of which is monosubstituted by A or [C(R³)₂]_(n)Het¹.

Het¹ preferably denotes a monocyclic saturated heterocycle having 1 to 2 N and/or O atoms, which may be mono- or disubstituted by A and/or ═O (carbonyl oxygen).

Het¹ particularly preferably denotes pyrrolidine, piperidine, piperazine or morpholine, each of which is unsubstituted or mono- or disubstituted by A and/or ═O (carbonyl oxygen).

R¹ preferably denotes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, methyl, ethyl, propyl or isopropyl, furthermore also H.

The unsaturated, saturated or aromatic 6-membered heterocycle having 1 to 4 N and/or O atoms in the meaning of R² has, for example, the following meanings: furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl or thiadiazolyl.

R² preferably denotes an unsaturated or aromatic 5- or 6-membered heterocycle having 1 to 4 N and/or O atoms, which may be unsubstituted or mono-, di- or trisubstituted by Hal, A, [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ and/or O[C(R³)₂]_(n)Het.

R² particularly preferably denotes furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl or thiadiazolyl, each of which is monosubstituted by Hal, A, [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ or O[C(R³)₂]_(n)Het.

R³ preferably denotes H, methyl, ethyl or propyl, very particularly preferably H.

R⁴, R^(4′) preferably denote H.

Hal preferably denotes F, Cl or Br, but also I, particularly preferably F or Cl.

Throughout the invention, all radicals which occur more than once may be identical or different, i.e. are independent of one another.

The compounds of the formula I may have one or more chiral centres and can therefore occur in various stereoisomeric forms. The formula I encompasses all these forms.

Accordingly, the invention relates, in particular, to the compounds of the formula I in which at least one of the said radicals has one of the preferred meanings indicated above. Some preferred groups of compounds may be expressed by the following sub-formulae Ia to Ik, which conform to the formula I and in which the radicals not designated in greater detail have the meaning indicated for the formula I, but in which

-   -   in Ia R² denotes an unsaturated or aromatic 5- or 6-membered         heterocycle having 1 to 4 N and/or O atoms, which may be         unsubstituted or mono-, di- or trisubstituted by Hal, A,         [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ and/or         O[C(R³)₂]_(n)Het;     -   in Ib R⁴, R^(4′) denote H;     -   in Ic Het denotes a monocyclic saturated, unsaturated or         aromatic heterocycle having 1 to 4 N, O and/or S atoms, which         may be unsubstituted or mono-, di- or trisubstituted by A and/or         [C(R³)₂]_(n)Het¹;     -   in Id A denotes unbranched or branched alkyl having 1-8 C atoms,         in which 1-7 H atoms may be replaced by F and/or Cl,         -   or         -   cyclic alkyl having 3-7 C atoms;     -   in Ie R³ denotes H, methyl, ethyl or propyl;

in If Het¹ denotes a monocyclic saturated heterocycle having 1 to 2 N and/or O atoms, which may be mono- or disubstituted by A and/or ═O (carbonyl oxygen);

-   -   in Ig R² denotes furyl, thienyl, pyrrolyl, imidazolyl,         pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl,         pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl or         thiadiazolyl, each of which is monosubstituted by Hal, A,         [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ or         O[C(R³)₂]_(n)Het;     -   in Ih Het denotes piperidinyl, piperazinyl, pyrrolidinyl,         morpholinyl, furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl,         oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl,         pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl, thiadiazolyl,         pyridazinyl or pyrazinyl, each of which is monosubstituted by A         or [C(R³)₂]_(n)Het¹;     -   in Ii Het¹ denotes pyrrolidine, piperidine, piperazine or         morpholine, each of which is unsubstituted or mono- or         disubstituted by A and/or ═O (carbonyl oxygen);     -   in Ij R¹ denotes H or A,         -   R² denotes an unsaturated or aromatic 5- or 6-membered             heterocycle having 1 to 4 N and/or O atoms, which may be             unsubstituted or mono-, di- or trisubstituted by Hal, A,             [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂             and/or O[C(R³)₂]_(n)Het,         -   R³ denotes H, methyl, ethyl or propyl,         -   R⁴, R^(4′) denote H,         -   Het denotes a monocyclic saturated, unsaturated or aromatic             heterocycle having 1 to 4 N, O and/or S atoms, which may be             unsubstituted or mono-, di- or trisubstituted by A and/or             [C(R³)₂]_(n)Het¹,         -   Het¹ denotes a monocyclic saturated heterocycle having 1 to             2 N and/or O atoms, which may be mono- or disubstituted by A             and/or ═O (carbonyl oxygen),         -   A denotes unbranched or branched alkyl having 1-8 C atoms,             in which 1-7 H atoms may be replaced by F and/or Cl,             -   or             -   cyclic alkyl having 3-7 C atoms,         -   Hal denotes F, Cl, Br or I,         -   n denotes 0, 1, 2, 3 or 4;     -   in Ik R¹ denotes H or A,         -   R² denotes furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl,             oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl,             pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl or             thiadiazolyl, each of which is monosubstituted by Hal, A,             [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ or             O[C(R³)₂]_(n)Het,         -   R³ denotes H, methyl, ethyl or propyl,         -   R⁴, R^(4′) denote H,         -   Het denotes piperidinyl, piperazinyl, pyrrolidinyl,             morpholinyl, furyl, thienyl, pyrrolyl, imidazolyl,             pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl,             pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl,             thiadiazolyl, pyridazinyl or pyrazinyl, each of which is             monosubstituted by A or [C(R³)₂]_(n)Het¹,         -   Het¹ denotes pyrrolidine, piperidine, piperazine or             morpholine, each of which is unsubstituted or mono- or             disubstituted by A and/or ═O (carbonyl oxygen),         -   A denotes unbranched or branched alkyl having 1-8 C atoms,             in which 1-7 H atoms may be replaced by F and/or Cl,             -   or             -   cyclic alkyl having 3-7 C atoms,         -   Hal denotes F, Cl, Br or I,         -   n denotes 0, 1, 2, 3 or 4;             and pharmaceutically usable salts, tautomers and             stereoisomers thereof, including mixtures thereof in all             ratios.

The compounds of the formula I and also the starting materials for their preparation are, in addition, prepared by methods known per se, as described in the literature (for example in the standard works, such as Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], Georg-Thieme-Verlag, Stuttgart), to be precise under reaction conditions which are known and suitable for the said reactions. Use can also be made here of variants known per se which are not mentioned here in greater detail.

The starting compounds of the formulae II and III are generally known. If they are novel, however, they can be prepared by methods known per se. The pyridazinones of the formula II used are, if not commercially available, generally prepared by the method of W. J. Coates; A. McKillop, Synthesis, 1993, 334-342.

Compounds of the formula I can preferably be obtained by reacting a compound of the formula II with a compound of the formula III.

In the compounds of the formula III, L preferably denotes Cl, Br, I or a free or reactively modified OH group, such as, for example, an activated ester, an imidazolide or alkylsulfonyloxy having 1-6 C atoms (preferably methylsulfonyloxy or trifluoromethylsulfonyloxy) or arylsulfonyloxy having 6-10 C atoms (preferably phenyl- or p-tolylsulfonyloxy).

The reaction is generally carried out in the presence of an acid-binding agent, preferably an organic base, such as DIPEA, triethylamine, dimethylaniline, pyridine or quinoline.

The addition of an alkali or alkaline earth metal hydroxide, carbonate or bicarbonate or another salt of a weak acid of the alkali or alkaline earth metals, preferably of potassium, sodium, calcium or caesium, may also be favourable.

Depending on the conditions used, the reaction time is between a few minutes and 14 days, the reaction temperature is between about −30° and 140°, normally between −10° and 90°, in particular between about 0° and about 70°.

Examples of suitable inert solvents are hydrocarbons, such as hexane, petroleum ether, benzene, toluene or xylene; chlorinated hydrocarbons, such as trichloroethylene, 1,2-dichloroethane, carbon tetrachloride, chloroform or dichloromethane; alcohols, such as methanol, ethanol, isopropanal, n-propanol, n-butanol or tert-butanol; ethers, such as diethyl ether, diisopropyl ether, tetrahydrofuran (THF) or dioxane; glycol ethers, such as ethylene glycol monomethyl or monoethyl ether, ethylene glycol dimethyl ether (diglyme); ketones, such as acetone or butanone; amides, such as acetamide, dimethylacetamide or dimethylformamide (DMF); nitriles, such as acetonitrile; sulfoxides, such as dimethyl sulfoxide (DMSO); carbon disulfide; carboxylic acids, such as formic acid or acetic acid; nitro compounds, such as nitromethane or nitrobenzene; esters, such as ethyl acetate, or mixtures of the said solvents.

Particular preference is given to acetonitrile, dichloromethane and/or DMF.

The reaction of a compound of the formula II with a compound of the formula III in which L denotes OH, is preferably carried out in a Mitsunobu reaction by addition of, for example, triphenylphosphine and a dialkyl azodicarboxylate. THF is preferred as solvent.

The compounds of the formula I can furthermore be obtained by converting a radical R² into another radical R² by, for example, arylating a heterocycle in a Suzuki reaction.

The compounds of the formula I can furthermore be obtained by liberating them from their functional derivatives by solvolysis, in particular hydrolysis, or by hydrogenolysis.

Preferred starting materials for the solvolysis or hydrogenolysis are those which contain corresponding protected amino and/or hydroxyl groups instead of one or more free amino and/or hydroxyl groups, preferably those which carry an amino-protecting group instead of an H atom bonded to an N atom, for example those which conform to the formula I, but contain an NHR′ group (in which R′ is an amino-protecting group, for example BOC or CBZ) instead of an NH₂ group,

Preference is furthermore given to starting materials which carry a hydroxyl-protecting group instead of the H atom of a hydroxyl group, for example those which conform to the formula I, but contain an R″O-phenyl group (in which R″ is a hydroxyl-protecting group) instead of a hydroxy-phenyl group.

It is also possible for a plurality of—identical or different—protected amino and/or hydroxyl groups to be present in the molecule of the starting material. If the protecting groups present are different from one another, they can in many cases be cleaved off selectively.

The term “amino-protecting group” is known in general terms and relates to groups which are suitable for protecting (blocking) an amino group against chemical reactions, but are easy to remove after the desired chemical reaction has been carried out elsewhere in the molecule. Typical of such groups are, in particular, unsubstituted or substituted acyl, aryl, aralkoxymethyl or aralkyl groups. Since the amino-protecting groups are removed after the desired reaction (or reaction sequence), their type and size are furthermore not crucial; however, preference is given to those having 1-20, in particular 1-8, carbon atoms. The term “acyl group” is to be understood in the broadest sense in connection with the present process. It includes acyl groups derived from aliphatic, araliphatic, aromatic or heterocyclic carboxylic acids or sulfonic acids, and, in particular, alkoxycarbonyl, aryloxycarbonyl and especially aralkoxycarbonyl groups. Examples of such acyl groups are alkanoyl, such as acetyl, propionyl and butyryl; aralkanoyl, such as phenylacetyl; aroyl, such as benzoyl and tolyl; aryloxyalkanoyl, such as POA; alkoxycarbonyl, such as methoxycarbonyl, ethoxycarbonyl, 2,2,2-trichioroethoxycarbonyl, BOC and 2-iodoethoxycarbonyl; aralkoxycarbonyl, such as CBZ (“carbobenzoxy”), 4-methoxybenzyloxycarbonyl and FMOC; and arylsulfonyl, such as Mtr, Pbf and Pmc. Preferred amino-protecting groups are BOC and Mtr, furthermore CBZ, Fmoc, benzyl and acetyl.

The term “hydroxyl-protecting group” is likewise known in general terms and relates to groups which are suitable for protecting a hydroxyl group against chemical reactions, but are easy to remove after the desired chemical reaction has been carried out elsewhere in the molecule. Typical of such groups are the above-mentioned unsubstituted or substituted aryl, aralkyl or acyl groups, furthermore also alkyl groups. The nature and size of the hydroxyl-protecting groups are not crucial since they are removed again after the desired chemical reaction or reaction sequence; preference is given, to groups having 1-20, in particular 1-10, carbon atoms. Examples of hydroxyl-protecting groups are, inter alia, tert-butoxycarbonyl, benzyl, p-nitrobenzoyl, p-toluenesulfonyl, tert-butyl and acetyl, where benzyl and tert-butyl are particularly preferred. The COOH groups in aspartic acid and glutamic acid are preferably protected in the form of their tert-butyl esters (for example Asp(OBut)).

The compounds of the formula I are liberated from their functional derivatives—depending on the protecting group used—for example using strong acids, advantageously using TFA or perchloric acid, but also using other strong inorganic acids, such as hydrochloric acid or sulfuric acid, strong organic carboxylic acids, such as trichloroacetic acid, or sulfonic acids, such as benzene- or p-toluenesulforiic acid. The presence of an additional inert solvent is possible, but is not always necessary. Suitable inert solvents are preferably organic, for example carboxylic acids, such as acetic acid, ethers, such as tetrahydrofuran or dioxane, amides, such as DMF, halogenated hydrocarbons, such as dichloromethane, furthermore also alcohols, such as methanol, ethanol or isopropanol, and water. Mixtures of the above-mentioned solvents are furthermore suitable. TFA is preferably used in excess without addition of a further solvent, and perchloric acid is preferably used in the form of a mixture of acetic acid and 70% perchloric acid in the ratio 9:1. The reaction temperatures for the cleavage are advantageously between about 0 and about 50°, preferably between 15 and 30° (room temperature).

The BOC, OBut, Pbf, Pmc and Mtr groups can, for example, preferably be cleaved off using TFA in dichloromethane or using approximately 3 to 5N HCl in dioxane at 15-30°, and the FMOC group can be cleaved off using an approximately 5 to 50% solution of dimethylamine, diethylamine or piperidine in DMF at 15-30°.

The trityl group is employed to protect the amino acids histidine, asparagine, glutamine and cysteine. They are cleaved off, depending on the desired end product, using TFA/10% thiophenol, with the trityl group being cleaved off from all the said amino acids; on use of TFA/anisole or TFA/thioanisole, only the trityl group of His, Asn and Gln is cleaved off, whereas it remains on the Cys side chain.

The Pbf (pentamethylbenzofuranyl) group is employed to protect Arg. It is cleaved off using, for example, TFA in dichloromethane.

Hydrogenolytically removable protecting groups (for example CBZ or benzyl) can be cleaved off, for example, by treatment with hydrogen in the presence of a catalyst (for example a noble-metal catalyst, such as palladium, advantageously on a support, such as carbon). Suitable solvents here are those indicated above, in particular, for example, alcohols, such as methanol or ethanol, or amides, such as DMF. The hydrogenolysis is generally carried out at temperatures between about 0 and 100° and pressures between about 1 and 200 bar, preferably at 20-30° and 1-10 bar. Hydrogenolysis of the CBZ group succeeds well, for example, on 5 to 10% Pd/C in methanol or using ammonium formate (instead of hydrogen) on Pd/C in methanol/DMF at 20-30°.

Pharmaceutical Salts and Other Forms

The said compounds according to the invention can be used in their final non-salt form. On the other hand, the present invention also encompasses the use of these compounds in the form of their pharmaceutically acceptable salts, which can be derived from various organic and inorganic acids and bases by procedures known in the art. Pharmaceutically acceptable salt forms of the compounds of the formula I are for the most part prepared by conventional methods. If the compound of the formula I contains a carboxyl group, one of its suitable salts can be formed by reacting the compound with a suitable base to give the corresponding base-addition salt. Such bases are, for example, alkali metal hydroxides, including potassium hydroxide, sodium hydroxide and lithium hydroxide; alkaline earth metal hydroxides, such as barium hydroxide and calcium hydroxide; alkali metal alkoxides, for example potassium ethoxide and sodium propoxide; and various organic bases, such as piperidine, diethanolamine and N-methyl-glutamine. The aluminium salts of the compounds of the formula I are likewise included. In the case of certain compounds of the formula I, acid-addition salts can be formed by treating these compounds with pharmaceutically acceptable organic and inorganic acids, for example hydrogen halides, such as hydrogen chloride, hydrogen bromide or hydrogen iodide, other mineral acids and corresponding salts thereof, such as sulfate, nitrate or phosphate and the like, and alkyl- and monoarylsulfonates, such as ethanesulfonate, toluenesulfonate and benzenesulfonate, and other organic acids and corresponding salts thereof, such as acetate, trifluoro-acetate, tartrate, maleate, succinate, citrate, benzoate, salicylate, ascorbate and the like. Accordingly, pharmaceutically acceptable acid-addition salts of the compounds of the formula I include the following: acetate, adipate, alginate, arginate, aspartate, benzoate, benzenesulfonate (besylate), bisulfate, bisulfite, bromide, butyrate, camphorate, camphorsulfonate, caprylate, chloride, chlorobenzoate, citrate, cyclopentanepropionate, digluconate, dihydrogenphosphate, dinitrobenzoate, dodecylsulfate, ethane-sulfonate, fumarate, galacterate (from mucic acid), galacturonate, gluco-heptanoate, gluconate, glutamate, glycerophosphate, hemisuccinate, hemisulfate, heptanoate, hexanoate, hippurate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxyethanesulfonate, iodide, isethionate, isobutyrate, lactate, lactobionate, malate, maleate, malonate, mandelate, metaphosphate, methanesulfonate, methylbenzoate, monohydrogenphosphate, 2-naphthalenesulfonate, nicotinate, nitrate, oxalate, oleate, palmate, pectinate, persulfate, phenylacetate, 3-phenylpropionate, phosphate, phosphonate, phthalate, but this does not represent a restriction.

Furthermore, the base salts of the compounds according to the invention include aluminium, ammonium, calcium, copper, iron(III), iron(II), lithium, magnesium, manganese(III), manganese(II), potassium, sodium and zinc salts, but this is not intended to represent a restriction. Of the above-mentioned salts, preference is given to ammonium; the alkali metal salts sodium and potassium, and the alkaline earth metal salts calcium and magnesium. Salts of the compounds of the formula I which are derived from pharmaceutically acceptable organic non-toxic bases include salts of primary, secondary and tertiary amines, substituted amines, also including naturally occurring substituted amines, cyclic amines, and basic ion exchanger resins, for example arginine, betaine, caffeine, chioroprocaine, choline, N,N′-dibenzylethylenediamine (benzathine), dicyclohexylamine, diethanolamine, diethylamine, 2-diethylaminoethanol, 2-dimethylaminoethanol, ethanolamine, ethylenediamine, N-ethylmorpholine, N-ethyl-piperidine, glucamine, glucosamine, histidine, hydrabamine, isopropyl-amine, lidocaine, lysine, meglumine, N-methyl-D-glucamine, morpholine, piperazine, piperidine, polyamine resins, procaine, purines, theobromine, triethanolamine, triethylamine, trimethylamine, tripropylamine and tris-(hydroxymethyl)methylamine (tromethamine), but this is not intended to represent a restriction.

Compounds of the present invention which contain basic nitrogen-containing groups can be quaternised using agents such as (C₁-C₄)alkyl halides, for example methyl, ethyl, isopropyl and tert-butyl chloride, bromide and iodide; di(C₁-C₄)alkyl sulfates, for example dimethyl, diethyl and diamyl sulfate; (C₁₀-C₁₈)alkyl halides, for example decyl, dodecyl, lauryl, myristyl and stearyl chloride, bromide and iodide; and aryl(C₁-C₄)alkyl halides, for example benzyl chloride and phenethyl bromide. Both water- and oil-soluble compounds according to the invention can be prepared using such salts.

The above-mentioned pharmaceutical salts which are preferred include acetate, trifluoroacetate, besylate, citrate, fumarate, gluconate, hemisuccinate, hippurate, hydrochloride, hydrobromide, isethionate, mandelate, meglumine, nitrate, oleate, phosphonate, pivalate, sodium phosphate, stearate, sulfate, sulfosalicylate, tartrate, thiomalate, tosylate and tromethamine, but this is not intended to represent a restriction.

Particular preference is given to hydrochloride, dihydrochloride, hydrobromide, maleate, mesylate, phosphate, sulfate and succinate.

The acid-addition salts of basic compounds of the formula I are prepared by bringing the free base form into contact with a sufficient amount of the desired acid, causing the formation of the salt in a conventional manner. The free base can be regenerated by bringing the salt form into contact with a base and isolating the free base in a conventional manner. The free base forms differ in a certain respect from the corresponding salt forms thereof with respect to certain physical properties, such as solubility in polar solvents; for the purposes of the invention, however, the salts otherwise correspond to the respective free base forms thereof.

As mentioned, the pharmaceutically acceptable base-addition salts of the compounds of the formula I are formed with metals or amines, such as alkali metals and alkaline earth metals or organic amines. Preferred metals are sodium, potassium, magnesium and calcium. Preferred organic amines are N,N′-dibenzylethylenediamine, chloroprocaine, choline, diethanolamine, ethylenediamine, N-methyl-D-glucamine and procaine.

The base-addition salts of acidic compounds according to the invention are prepared by bringing the free acid form into contact with a sufficient amount of the desired base, causing the formation of the salt in a conventional manner. The free acid can be regenerated by bringing the salt form into contact with an acid and isolating the free acid in a conventional manner. The free acid forms differ in a certain respect from the corresponding salt forms thereof with respect to certain physical properties, such as solubility in polar solvents; for the purposes of the invention, however, the salts otherwise correspond to the respective free acid forms thereof.

If a compound according to the invention contains more than one group which is capable of forming pharmaceutically acceptable salts of this type, the invention also encompasses multiple salts. Typical multiple salt forms include, for example, bitartrate, diacetate, difumarate, dimeglumine, diphosphate, disodium and trihydrochioride, but this is not intended to represent a restriction.

With regard to that stated above, it can be seen that the expression “pharmaceutically acceptable salt” in the present connection is taken to mean an active ingredient which comprises a compound of the formula I in the form of one of its salts, in particular if this salt form imparts improved pharmacokinetic properties on the active ingredient compared with the free form of the active ingredient or any other salt form of the active ingredient used earlier. The pharmaceutically acceptable salt form of the active ingredient can also provide this active ingredient for the first time with a desired pharmacokinetic property which it did not have earlier and can even have a positive influence on the pharmacodynamics of this active ingredient with respect to its therapeutic efficacy in the body.

The invention furthermore relates to medicaments comprising at least one compound of the formula I and/or pharmaceutically usable derivatives, solvates and stereoisomers thereof, including mixtures thereof in all ratios, and optionally excipients and/or adjuvants.

Pharmaceutical formulations can be administered in the form of dosage units which comprise a predetermined amount of active ingredient per dosage unit. Such a unit can comprise, for example, 0.5 mg to 1 g, preferably 1 mg to 700 mg, particularly preferably 5 mg to 100 mg, of a compound according to the invention, depending on the condition treated, the method of administration and the age, weight and condition of the patient, or pharmaceutical formulations can be administered in the form of dosage units which comprise a predetermined amount of active ingredient per dosage unit. Preferred dosage unit formulations are those which comprise a daily dose or part-dose, as indicated above, or a corresponding fraction thereof of an active ingredient. Furthermore, pharmaceutical formulations of this type can be prepared using a process which is generally known in the pharmaceutical art.

Pharmaceutical formulations can be adapted for administration via any desired suitable method, for example by oral (including buccal or sublingual), rectal, nasal, topical (including buccal, sublingual or transdermal), vaginal or parenteral (including subcutaneous, intramuscular, intravenous or intradermal) methods. Such formulations can be prepared using all processes known in the pharmaceutical art by, for example, combining the active ingredient with the excipient(s) or adjuvant(s).

Pharmaceutical formulations adapted for oral administration can be administered as separate units, such as, for example, capsules or tablets; powders or granules; solutions or suspensions in aqueous or non-aqueous liquids; edible foams or foam foods; or oil-in-water liquid emulsions or water-in-oil liquid emulsions.

Thus, for example, in the case of oral administration in the form of a tablet or capsule, the active-ingredient component can be combined with an oral, non-toxic and pharmaceutically acceptable inert excipient, such as, for example, ethanol, glycerol, water and the like. Powders are prepared by comminuting the compound to a suitable fine size and mixing it with a pharmaceutical excipient comminuted in a similar manner, such as, for example, an edible carbohydrate, such as, for example, starch or mannitol. A flavour, preservative, dispersant and dye may likewise be present.

Capsules are produced by preparing a powder mixture as described above and filling shaped gelatine shells therewith. Glidants and lubricants, such as, for example, highly disperse silicic acid, talc, magnesium stearate, calcium stearate or polyethylene glycol in solid form, can be added to the powder mixture before the filling operation. A disintegrant or solubiliser, such as, for example, agar-agar, calcium carbonate or sodium carbonate, may likewise be added in order to improve the availability of the medicament after the capsule has been taken.

In addition, if desired or necessary, suitable binders, lubricants and disintegrants as well as dyes can likewise be incorporated into the mixture. Suitable binders include starch, gelatine, natural sugars, such as, for example, glucose or beta-lactose, sweeteners made from maize, natural and synthetic rubber, such as, for example, acacia, tragacanth or sodium alginate, carboxymethylcellulose, polyethylene glycol, waxes, and the like. The lubricants used in these dosage forms include sodium oleate, sodium stearate, magnesium stearate, sodium benzoate, sodium acetate, sodium chloride and the like. The disintegrants include, without being restricted thereto, starch, methylcellulose, agar, bentonite, xanthan gum and the like. The tablets are formulated by, for example, preparing a powder mixture, granulating or dry-pressing the mixture, adding a lubricant and a disintegrant and pressing the entire mixture to give tablets. A powder mixture is prepared by mixing the compound comminuted in a suitable manner with a diluent or a base, as described above, and optionally with a binder, such as, for example, carboxymethylcellulose, an alginate, gelatine or polyvinyl-pyrrolidone, a dissolution retardant, such as, for example, paraffin, an absorption accelerator, such as, for example, a quaternary salt, and/or an absorbant, such as, for example, bentonite, kaolin or dicalcium phosphate. The powder mixture can be granulated by wetting it with a binder, such as, for example, syrup, starch paste, acadia mucilage or solutions of cellulose or polymer materials and pressing it through a sieve. As an alternative to granulation, the powder mixture can be run through a tabletting machine, giving lumps of non-uniform shape, which are broken up to form granules. The granules can be lubricated by addition of stearic acid, a stearate salt, talc or mineral oil in order to prevent sticking to the tablet casting moulds. The lubricated mixture is then pressed to give tablets. The compounds according to the invention can also be combined with a free-flowing inert excipient and then pressed directly to give tablets without carrying out the granulation or dry-pressing steps. A transparent or opaque protective layer consisting of a shellac sealing layer, a layer of sugar or polymer material and a gloss layer of wax may be present. Dyes can be added to these coatings in order to be able to differentiate between different dosage units.

Oral liquids, such as, for example, solution, syrups and elixirs, can be prepared in the form of dosage units so that a given quantity comprises a pre-specified amount of the compound. Syrups can be prepared by dissolving the compound in an aqueous solution with a suitable flavour, while elixirs are prepared using a non-toxic alcoholic vehicle. Suspensions can be formulated by dispersion of the compound in a non-toxic vehicle. Solubilisers and emulsifiers, such as, for example, ethoxylated isostearyl alcohols and polyoxyethylene sorbitol ethers, preservatives, flavour additives, such as, for example, peppermint oil or natural sweeteners or saccharin, or other artificial sweeteners and the like, can likewise be added.

The dosage unit formulations for oral administration can, if desired, be encapsulated in microcapsules. The formulation can also be prepared in such a way that the release is extended or retarded, such as, for example, by coating or embedding of particulate material in polymers, wax and the like.

The compounds of the formula I and salts, solvates and physiologically functional derivatives thereof can also be administered in the form of liposome delivery systems, such as, for example, small unilamellar vesicles, large unilamellar vesicles and multilamellar vesicles. Liposomes can be formed from various phospholipids, such as, for example, cholesterol, stearylamine or phosphatidylcholines.

The compounds of the formula I and the salts, solvates and physiologically functional derivatives thereof can also be delivered using monoclonal antibodies as individual carriers to which the compound molecules are coupled. The compounds can also be coupled to soluble polymers as targeted medicament carriers. Such polymers may encompass polyvinylpyrrolidone, pyran copolymer, polyhydroxypropylmethacrylamidophenol, polyhydroxyethylaspartamidophenol or polyethylene oxide polylysine, substituted by palmitoyl radicals. The compounds may furthermore be coupled to a class of biodegradable polymers which are suitable for achieving controlled release of a medicament, for example polylactic acid, poly-epsiloncaprolactone, polyhydroxybutyric acid, polyorthoesters, polyacetals, polydihydroxypyrans, polycyanoacrylates and crosslinked or amphipathic block copolymers of hydrogels.

Pharmaceutical formulations adapted for transdermal administration can be administered as independent plasters for extended, close contact with the epidermis of the recipient. Thus, for example, the active ingredient can be delivered from the plaster by iontophoresis, as described in general terms in Pharmaceutical Research, 3(6), 318 (1986).

Pharmaceutical compounds adapted for topical administration can be formulated as ointments, creams, suspensions, lotions, powders, solutions, pastes, gels, sprays, aerosols or oils.

For the treatment of the eye or other external tissue, for example mouth and skin, the formulations are preferably applied as topical ointment or cream. In the case of formulation to give an ointment, the active ingredient can be employed either with a paraffinic or a water-miscible cream base. Alternatively, the active ingredient can be formulated to give a cream with an oil-in-water cream base or a water-in-oil base.

Pharmaceutical formulations adapted for topical application to the eye include eye drops, in which the active ingredient is dissolved or suspended in a suitable carrier, in particular an aqueous solvent.

Pharmaceutical formulations adapted for topical application in the mouth encompass lozenges, pastilles and mouthwashes.

Pharmaceutical formulations adapted for rectal administration can be administered in the form of suppositories or enemas.

Pharmaceutical formulations adapted for nasal administration in which the carrier substance is a solid comprise a coarse powder having a particle size, for example, in the range 20-500 microns, which is administered in the manner in which snuff is taken, i.e. by rapid inhalation via the nasal passages from a container containing the powder held close to the nose. Suitable formulations for administration as nasal spray or nose drops with a liquid as carrier substance encompass active-ingredient solutions in water or oil.

Pharmaceutical formulations adapted for administration by inhalation encompass finely particulate dusts or mists, which can be generated by various types of pressurised dispensers with aerosols, nebulisers or insufflators.

Pharmaceutical formulations adapted for vaginal administration can be administered as pessaries, tampons, creams, gels, pastes, foams or spray formulations.

Pharmaceutical formulations adapted for parenteral administration include aqueous and non-aqueous sterile injection solutions comprising antioxidants, buffers, bacteriostatics and solutes, by means of which the formulation is rendered isotonic with the blood of the recipient to be treated; and aqueous and non-aqueous sterile suspensions, which may comprise suspension media and thickeners. The formulations can be administered in single-dose or multidose containers, for example sealed ampoules and vials, and stored in freeze-dried (lyophilised) state, so that only the addition of the sterile carrier liquid, for example water for injection purposes, immediately before use is necessary. Injection solutions and suspensions prepared in accordance with the recipe can be prepared from sterile powders, granules and tablets.

It goes without saying that, in addition to the above particularly mentioned constituents, the formulations may also comprise other agents usual in the art with respect to the particular type of formulation; thus, for example, formulations which are suitable for oral administration may comprise flavours

A therapeutically effective amount of a compound of the formula I depends on a number of factors, including, for example, the age and weight of the animal, the precise condition that requires treatment, and its severity, the nature of the formulation and the method of administration, and is ultimately determined by the treating doctor or vet. However, an effective amount of a compound according to the invention for the treatment of neoplastic growth, for example colon or breast carcinoma, is generally in the range from 0.1 to 100 mg/kg of body weight of the recipient (mammal) per day and particularly typically in the range from 1 to 10 mg/kg of body weight per day. Thus, the actual amount per day for an adult mammal weighing 70 kg is usually between 70 and 700 mg, where this amount can be administered as a single dose per day or usually in a series of part-doses (such as, for example, two, three, four, five or six) per day, so that the total daily dose is the same. An effective amount of a salt or solvate or of a physiologically functional derivative thereof can be determined as the fraction of the effective amount of the compound according to the invention per se. It can be assumed that similar doses are suitable for the treatment of other conditions mentioned above.

The invention furthermore relates to medicaments comprising at least one compound of the formula I and/or pharmaceutically usable salts and stereoisomers thereof, including mixtures thereof in all ratios, and at least one further medicament active ingredient.

The invention also relates to a set (kit) consisting of separate packs of

-   -   (a) an effective amount of a compound of the formula I and/or         pharmaceutically usable salts and stereoisomers thereof,         including mixtures thereof in all ratios, and     -   (b) an effective amount of a further medicament active         ingredient.

The set comprises suitable containers, such as boxes, individual bottles, bags or ampoules. The set may, for example, comprise separate ampoules, each containing an effective amount of a compound of the formula I and/or pharmaceutically usable derivatives, solvates and stereoisomers thereof, including mixtures thereof in all ratios,

and an effective amount of a further medicament active ingredient in dissolved or lyophilised form.

Use

The present compounds are suitable as pharmaceutical active ingredients for mammals, especially for humans, in the treatment of tyrosine kinase-induced diseases. These diseases include the proliferation of tumor cells, pathological neovascularisation (or angiogenesis) which promotes the growth of solid tumors, ocular neovascularisation (diabetic retinopathy, age-induced macular degeneration and the like) and inflammation (psoriasis, rheumatoid arthritis and the like).

The present invention encompasses the use of the compounds of the formula I and/or physiologically acceptable salts and solvates thereof for the preparation of a medicament for the treatment or prevention of cancer. Preferred carcinomas for the treatment originate from the group cerebral carcinoma, urogenital tract carcinoma, carcinoma of the lymphatic system, stomach carcinoma, laryngeal carcinoma and lung carcinoma. A further group of preferred forms of cancer are monocytic leukaemia, lung adeno-carcinoma, small-cell lung carcinomas, pancreatic cancer, glioblastornas and breast carcinoma.

Also encompassed is the use of the compounds according to claim 1 according to the invention and/or physiologically acceptable salts and solvates thereof for the preparation of a medicament for the treatment or prevention of a disease in which angiogenesis is implicated.

Such a disease in which angiogenesis is implicated is an ocular disease, such as retinal vascularisation, diabetic retinopathy, age-induced macular degeneration and the like.

The use of compounds of the formula I and/or physiologically acceptable salts and solvates thereof for the preparation of a medicament for the treatment or prevention of inflammatory diseases also falls within the scope of the present invention. Examples of such inflammatory diseases include rheumatoid arthritis, psoriasis, contact dermatitis, delayed hyper-sensitivity reaction and the like.

Also encompassed is the use of the compounds of the formula I and/or physiologically acceptable salts and solvates thereof for the preparation of a medicament for the treatment or prevention of a tyrosine kinase-induced disease or a tyrosine kinase-induced condition in a mammal, in which to this method a therapeutically effective amount of a compound according to the invention is administered to a sick mammal in need of such treatment. The therapeutic amount varies according to the specific disease and can be determined by the person skilled in the art without undue effort.

The present invention also encompasses the use compounds of the formula I and/or physiologically acceptable salts and solvates thereof for the preparation of a medicament for the treatment or prevention of retinal vascularisation.

Methods for the treatment or prevention of ocular diseases, such as diabetic retinopathy and age-induced macular degeneration, are likewise part of the invention. The use for the treatment or prevention of inflammatory diseases, such as rheumatoid arthritis, psoriasis, contact dermatitis and delayed hypersensitivity reaction, as well as the treatment or prevention of bone pathologies from the group osteosarcoma, osteoarthritis and rickets, likewise falls within the scope of the present invention.

The expression “tyrosine kinase-induced diseases or conditions” refers to pathological conditions that depend on the activity of one or more tyrosine kinases. Tyrosine kinases either directly or indirectly participate in the signal transduction pathways of a variety of cellular activities, including proliferation, adhesion and migration and differentiation. Diseases associated with tyrosine kinase activity include proliferation of tumor cells, pathological neovascularisation that promotes the growth of solid tumors, ocular neovascularisation (diabetic retinopathy, age-induced macular degeneration and the like) and inflammation (psoriasis, rheumatoid arthritis and the like).

The compounds of the formula I can be administered to patients for the treatment of cancer, in particular fast-growing tumors.

The invention thus relates to the use of compounds of the formula I, and pharmaceutically usable salts and stereoisomers thereof, including mixtures thereof in all ratios, for the preparation of a medicament for the treatment of diseases in which the inhibition, regulation and/or modulation of kinase signal transduction plays a role.

Preference is given here to Met kinase.

Preference is given to the use of compounds of the formula I, and pharmaceutically usable salts and stereoisomers thereof, including mixtures thereof in all ratios,

for the preparation of a medicament for the treatment of diseases which are influenced by inhibition of tyrosine kinases by the compounds according to claim 1.

Particular preference is given to the use for the preparation of a medicament for the treatment of diseases which are influenced by inhibition of Met kinase by the compounds according to claim 1.

Especial preference is given to the use for the treatment of a disease where the disease is a solid tumor.

The solid tumor is preferably selected from the group of tumors of the lung, squamous epithelium, the bladder, the stomach, the kidneys, of head and neck, the oesophagus, the cervix, the thyroid, the intestine, the liver, the brain, the prostate, the urogenital tract, the lymphatic system, the stomach and/or the larynx.

The solid tumor is furthermore preferably selected from the group lung adenocarcinoma, small-cell lung carcinomas, pancreatic cancer, glioblastomas, colon carcinoma and breast carcinoma.

Preference is furthermore given to the use for the treatment of a tumor of the blood and immune system, preferably for the treatment of a tumor selected from the group of acute myeloid leukaemia, chronic myeloid leukaemia, acute lymphatic leukaemia and/or chronic lymphatic leukaemia.

The disclosed compounds of the formula I can be administered in combination with other known therapeutic agents, including anticancer agents. As used here, the term “anticancer agent” relates to any agent which is administered to a patient with cancer for the purposes of treating the cancer.

The anti-cancer treatment defined herein may be applied as a sole therapy or may involve, in addition to the compound of the invention, conventional surgery or radiotherapy or chemotherapy. Such chemotherapy may include one or more of the following categories of anti-tumor agents:

(i) antiproliferative/antineoplastic/DNA-damaging agents and combinations thereof, as used in medical oncology, such as alkylating agents (for example cis-platin, carboplatin, cyclophosphamide, nitrogen mustard, melphalan, chloroambucil, busulphan and nitrosoureas); antimetabolites (for example antifolates such as fluoropyrimidines like 5-fluorouracil and tegafur, raltitrexed, methotrexate, cytosine arabinoside, hydroxyurea and gemcitabine); antitumor antibiotics (for example anthracyclines, like adriamycin, bleomycin, doxorubicin, daunomycin, epirubicin, idarubicin, mitomycin-C, dactinomycin and mithramycin); antimitotic agents (for example vinca alkaloids, like vincristine, vinblastine, vindesine and vinorelbine, and taxoids, like taxol and taxotere); topoisomerase inhibitors (for example epipodophyllotoxins, like etoposide and teniposide, amsacrine, topotecan, irinotecan and camptothecin) and cell-differentiating agents (for example all-trans-retinoic acid, 13-cis-retinoic acid and fenretinide); (ii) cytostatic agents, such as antioestrogens (for example tamoxifen, toremifene, raloxifene, droloxifene and iodoxyfene), oestrogen receptor downregulators (for example fulvestrant), antiandrogens (for example bi-calutamide, flutamide, nilutamide and cyproterone acetate), LHRH antagonists or LHRH agonists (for example goserelin, leuprorelin and buserelin), progesterones (for example megestrol acetate), aromatase inhibitors (for example as anastrozole, letrozole, vorazole and exemestane) and inhibitors of 5α-reductase, such as finasteride; (iii) agents which inhibit cancer cell invasion (for example metallo-proteinase inhibitors, like marimastat, and inhibitors of urokinase plasminogen activator receptor function); (iv) inhibitors of growth factor function, for example such inhibitors include growth factor antibodies, growth factor receptor antibodies (for example the anti-erbb2 antibody trastuzumab [Herceptin™] and the anti-erbb1 antibody cetuximab [C225]), farnesyl transferase inhibitors, tyrosine kinase inhibitors and serine/threonine kinase inhibitors, for example inhibitors of the epidermal growth factor family (for example EGFR family tyrosine kinase inhibitors, such as N-(3-chloro-4-fluorophenyl)-7-methoxy-6-(3-morpholinopropoxy)quinazolin-4-amine (gefitinib, AZD1839), N-(3-ethynylphenyl)-6,7-bis(2-methoxyethoxy)quinazolin-4-amine(erlotinib, OSI-774) and 6-acrylamido-N-(3-chloro-4-fluorophenyl)-7-(3-morpholino-propoxy)quinazolin-4-amine (Cl 1033)), for example inhibitors of the platelet-derived growth factor family and for example inhibitors of the hepatocyte growth factor family; (v)antiangiogenic agents, such as those which inhibit the effects of vascular endothelial growth factor, (for example the anti-vascular endothelial cell growth factor antibody bevacizumab [Avastin™], compounds such as those disclosed in published international patent applications WO 97/22596, WO 97/30035, WO 97/32856 and WO 98/13354) and compounds that work by other mechanisms (for example linomide, inhibitors of integrin αvβ3 function and angiostatin); (vi) vessel-damaging agents, such as combretastatin A4 and compounds disclosed in international patent applications WO 99/02166, WO 00/40529, WO 00/41669, WO 01/92224, WO 02/04434 and WO 02/08213; (vii) antisense therapies, for example those which are directed to the targets listed above, such as ISIS 2503, an anti-Ras antisense; (viii) gene therapy approaches, including, for example, approaches for replacement of aberrant genes, such as aberrant p53 or aberrant BRCA1 or BRCA2, GDEPT (gene-directed enzyme pro-drug therapy) approaches, such as those using cytosine deaminase, thymidine kinase or a bacterial nitroreductase enzyme, and approaches for increasing patient tolerance to chemotherapy or radiotherapy, such as multi-drug resistance gene therapy; and (ix) immunotherapy approaches, including, for example, ex-vivo and in-vivo approaches for increasing the immunogenicity of patient tumor cells, such as transfection with cytokines, such as interleukin 2, interleukin 4 or granulocyte-macrophage colony stimulating factor, approaches for decreasing T-cell anergy, approaches using transfected immune cells, such as cytokine-transfected dendritic cells, approaches using cytokine-transfected tumor cell lines, and approaches using anti-idiotypic antibodies.

The medicaments from Table 1 below are preferably, but not exclusively, combined with the compounds of the formula I.

TABLE 1 Alkylating agents Cyclophosphamide Lomustine Busulfan Procarbazine Ifosfamide Altretamine Melphalan Estramustine phosphate Hexamethylmelamine Mechloroethamine Thiotepa Streptozocin chloroambucil Temozolomide Dacarbazine Semustine Carmustine Platinum agents Cisplatin Carboplatin Oxaliplatin ZD-0473 (AnorMED) Spiroplatin Lobaplatin (Aetema) Carboxyphthalatoplatinum Satraplatin (Johnson Tetraplatin Matthey) Ormiplatin BBR-3464 Iproplatin (Hoffmann-La Roche) SM-11355 (Sumitomo) AP-5280 (Access) Antimetabolites Azacytidine Tomudex Gemcitabine Trimetrexate Capecitabine Deoxycoformycin 5-fluorouracil Fludarabine Floxuridine Pentostatin 2-chlorodesoxyadenosine Raltitrexed 6-Mercaptopurine Hydroxyurea 6-Thioguanine Decitabine (SuperGen) Cytarabine Clofarabine (Bioenvision) 2-fluorodesoxycytidine Irofulven (MGI Pharma) Methotrexate DMDC (Hoffmann-La Idatrexate Roche) Ethynylcytidine (Taiho) Topoisomerase Amsacrine Rubitecan (SuperGen) inhibitors Epirubicin Exatecan mesylate Etoposide (Daiichi) Teniposide or Quinamed (ChemGenex) mitoxantrone Gimatecan (Sigma-Tau) Irinotecan (CPT-11) Diflomotecan (Beaufour- 7-ethyl-10- Ipsen) hydroxycamptothecin TAS-103 (Taiho) Topotecan Elsamitrucin (Spectrum) Dexrazoxanet J-107088 (Merck & Co) (TopoTarget) BNP-1350 (BioNumerik) Pixantrone (Novuspharma) CKD-602 (Chong Kun Rebeccamycin analogue Dang) (Exelixis) KW-2170 (Kyowa Hakko) BBR-3576 (Novuspharma) Antitumour Dactinomycin (Actinomycin Amonafide antibiotics D) Azonafide Doxorubicin (Adriamycin) Anthrapyrazole Deoxyrubicin Oxantrazole Valrubicin Losoxantrone Daunorubicin Bleomycin sulfate (Daunomycin) (Blenoxan) Epirubicin Bleomycinic acid Therarubicin Bleomycin A Idarubicin Bleomycin B Rubidazon Mitomycin C Plicamycinp MEN-10755 (Menarini) Porfiromycin GPX-100 (Gem Cyanomorpholinodoxo- Pharmaceuticals) rubicin Mitoxantron (Novantron) Antimitotic agents Paclitaxel SB 408075 Docetaxel (GlaxoSmithKline) Colchicine E7010 (Abbott) Vinblastine PG-TXL (Cell Vincristine Therapeutics) Vinorelbine IDN 5109 (Bayer) Vindesine A 105972 (Abbott) Dolastatin 10 (NCI) A 204197 (Abbott) Rhizoxin (Fujisawa) LU 223651 (BASF) Mivobulin (Warner- D 24851 (ASTA Medica) Lambert) ER-86526 (Eisai) Cemadotin (BASF) Combretastatin A4 (BMS) RPR 109881A (Aventis) Isohomohalichondrin-B TXD 258 (Aventis) (PharmaMar) Epothilone B (Novartis) ZD 6126 (AstraZeneca) T 900607 (Tularik) PEG-Paclitaxel (Enzon) T 138067 (Tularik) AZ10992 (Asahi) Cryptophycin 52 (Eli Lilly) !DN-5109 (Indena) Vinflunine (Fabre) AVLB (Prescient Auristatin PE (Teikoku NeuroPharma) Hormone) Azaepothilon B (BMS) BMS 247550 (BMS) BNP-7787 (BioNumerik) BMS 184476 (BMS) CA-4-prodrug (OXiGENE) BMS 188797 (BMS) Dolastatin-10 (NrH) Taxoprexin (Protarga) CA-4 (OXiGENE) Aromatase Aminoglutethimide Exemestan inhibitors Letrozole Atamestan (BioMedicines) Anastrazole YM-511 (Yamanouchi) Formestan Thymidylate Pemetrexed (Eli Lilly) Nolatrexed (Eximias) synthase ZD-9331 (BTG) CoFactor ™ (BioKeys) inhibitors DNA antagonists Trabectedin (PharmaMar) Mafosfamide (Baxter Glufosfamide (Baxter International) International) Apaziquone (Spectrum Albumin + 32P (Isotope Pharmaceuticals) Solutions) O6-benzylguanine Thymectacin (NewBiotics) (Paligent) Edotreotid (Novartis) Farnesyl Arglabin (NuOncology Tipifarnib (Johnson & transferase Labs) Johnson) inhibitors Ionafarnib (Schering- Perillyl alcohol (DOR Plough) BioPharma) BAY-43-9006 (Bayer) Pump inhibitors CBT-1 (CBA Pharma) Zosuquidar Tariquidar (Xenova) trihydrochloride (Eli Lilly) MS-209 (Schering AG) Biricodar dicitrate (Vertex) Histone acetyl Tacedinaline (Pfizer) Pivaloyloxymethyl butyrate transferase inhibitors SAHA (Aton Pharma) (Titan) MS-275 (Schering AG) Depsipeptide (Fujisawa) Metalloproteinase Neovastat (Aeterna Laboratories) CMT-3 (CollaGenex) inhibitors Marimastat (British Biotech) BMS-275291 (Celltech) Ribonucleoside Gallium maltolate (Titan) Tezacitabine (Aventis) reductase inhibitors Triapin (Vion) Didox (Molecules for Health) TNF-alpha Virulizin (Lorus Therapeutics) Revimid (Celgene) agonists/ CDC-394 (Celgene) antagonists Endothelin-A receptor Atrasentan (Abbot) YM-598 (Yamanouchi) antagonists ZD-4054 (AstraZeneca) Retinoic acid receptor Fenretinide (Johnson & Alitretinoin (Ligand) agonists Johnson) LGD-1550 (Ligand) Immunomodulators Interferon Dexosome therapy (Anosys) Oncophage (Antigenics) Pentrix (Australian Cancer GMK (Progenics) Technology) Adenocarcinoma vaccine JSF-154 (Tragen) (Biomira) Cancer vaccine (Intercell) CTP-37 (AVI BioPharma) Norelin (Biostar) JRX-2 (Immuno-Rx) BLP-25 (Biomira) PEP-005 (Peplin Biotech) MGV (Progenics) Synchrovax vaccines (CTL !3-Alethin (Dovetail) Immuno) CLL-Thera (Vasogen) Melanoma vaccine (CTL Immuno) p21-RAS vaccine (Gem- Vax) Hormonal and Oestrogens Prednisone antihormonal Conjugated oestrogens Methylprednisolone agents Ethynyloestradiol Prednisolone chlorotrianisene Aminoglutethimide Idenestrol Leuprolide Hydroxyprogesterone Goserelin caproate Leuporelin Medroxyprogesterone Bicalutamide Testosterone Flutamide Testosterone propionate Octreotide Fluoxymesterone Nilutamide Methyltestosterone Mitotan Diethylstilbestrol P-04 (Novogen) Megestrol 2-Methoxyoestradiol (En- Tamoxifen treMed) Toremofin Arzoxifen (Eli Lilly) Dexamethasone Photodynamic Talaporfin (Light Sciences) Pd-Bacteriopheophorbid agents Theralux (Theratechnologies) (Yeda) Motexafin-Gadolinium Lutetium-Texaphyrin (Pharmacyclics) (Pharmacyclics) Hypericin Tyrosine kinase Imatinib (Novartis) Kahalide F (PharmaMar) inhibitors Leflunomide(Sugen/Pharmacia) CEP-701 (Cephalon) ZDI839 (AstraZeneca) CEP-751 (Cephalon) Erlotinib (Oncogene Science) MLN518 (Millenium) Canertjnib (Pfizer) PKC412 (Novartis) Squalamine (Genaera) Phenoxodiol O SU5416 (Pharmacia) Trastuzumab (Genentech) SU6668 (Pharmacia) C225 (ImClone) ZD4190 (AstraZeneca) rhu-Mab (Genentech) ZD6474 (AstraZeneca) MDX-H210 (Medarex) Vatalanib (Novartis) 2C4 (Genentech) PKI166 (Novartis) MDX-447 (Medarex) GW2016 (GlaxoSmith- ABX-EGF (Abgenix) Kline) IMC-1C11 (ImClone) EKB-509 (Wyeth) EKB-569 (Wyeth) Various agents SR-27897 (CCK-A inhibitor, BCX-1777 (PNP inhibitor, Sanofi-Synthelabo) BioCryst) Tocladesine (cyclic AMP Ranpirnase (ribonuclease agonist, Ribapharm) stimulant, Alfacell) Alvocidib (CDK inhibitor, Galarubicin (RNA synthesis Aventis) inhibitor, Dong-A) CV-247 (COX-2 inhibitor, Tirapazamine (reducing Ivy Medical) agent, SRI International) P54 (COX-2 inhibitor, N-Acetylcysteine (reducing Phytopharm) agent, Zambon) CapCell ™ (CYP450 R-Flurbiprofen (NF-kappaB stimulant, Bavarian Nordic) inhibitor, Encore) GCS-IOO (gal3 antagonist, 3CPA (NF-kappaB GlycoGenesys) inhibitor, Active Biotech) G17DT immunogen (gastrin Seocalcitol (vitamin D inhibitor, Aphton) receptor agonist, Leo) Efaproxiral (oxygenator, 131-I-TM-601 (DNA Allos Therapeutics) antagonist, PI-88 (heparanase inhibitor, TransMolecular) Progen) Eflornithin (ODC inhibitor, Tesmilifen (histamine antagonist, ILEX Oncology) YM BioSciences) Minodronic acid Histamine (histamine H2 (osteoclast inhibitor, receptor agonist, Maxim) Yamanouchi) Tiazofurin (IMPDH inhibitor, Indisulam (p53 stimulant, Ribapharm) Eisai) Cilengitide (integrin antagonist, Aplidin (PPT inhibitor, Merck KGaA) PharmaMar) SR-31747 (IL-1 antagonist, Rituximab (CD20 antibody, Sanofi-Synthelabo) Genentech) CCI-779 (mTOR kinase Gemtuzumab (CD33 inhibitor, Wyeth) antibody, Wyeth Ayerst) Exisulind (PDE-V inhibitor, PG2 (haematopoiesis Cell Pathways) promoter, Pharmagenesis) CP-461 (PDE-V inhibitor, Immunol ™ (triclosan Cell Pathways) mouthwash, Endo) AG-2037 (GART inhibitor, Triacetyluridine (uridine Pfizer) prodrug, Wellstat) WX-UK1 (plasminogen SN-4071 (sarcoma agent, activator inhibitor, Wilex) Signature BioScience) PBI-1402 (PMN stimulant, TransMID-107 ™ ProMetic LifeSciences) (immunotoxin, KS Bortezomib (proteasome Biomedix) inhibitor, Millennium) PCK-3145 (apoptosis SRL-172 (T-cell stimulant, promoter, Procyon) SR Pharma) Doranidazole (apoptosis TLK-286 (glutathione-S promoter, Pola) transferase inhibitor, Telik) CHS-828 (cytotoxic agent, PT-100 (growth factor Leo) agonist, Point Therapeutics) Trans-retinic acid Midostaurin (PKC inhibitor, (differentiator, NIH) Novartis) MX6 (apoptosis promoter, Bryostatin-1 (PKC stimulant, MAXIA) GPC Biotech) Apomine (apoptosis CDA-II (apoptosis promoter, promoter, ILEX Oncology) Everlife) Urocidin (apoptosis SDX-101 (apoptosis promoter, promoter, Bioniche) Salmedix) Ro-31-7453 (apoptosis Ceflatonin (apoptosis promoter, promoter, La Roche) ChemGenex) Brostallicin (apoptosis promoter, Pharmacia) Alkylating agents Cyclophosphamide Lomustine Busulfan Procarbazine Ifosfamide Altretamine Melphalan Estramustine phosphate Hexamethylmelamine Mechloroethamine Thiotepa Streptozocin chloroambucil Temozolomide Dacarbazine Semustine Carmustine Platinum agents Cisplatin Carboplatin Oxaliplatin ZD-0473 (AnorMED) Spiroplatin Lobaplatin (Aetema) Carboxyphthalatoplatinum Satraplatin (Johnson Tetraplatin Matthey) Ormiplatin BBR-3464 Iproplatin (Hoffmann-La Roche) SM-11355 (Sumitomo) AP-5280 (Access) Antimetabolites Azacytidine Tomudex Gemcitabine Trimetrexate Capecitabine Deoxycoformycin 5-fluorouracil Fludarabine Floxuridine Pentostatin 2-chlorodesoxyadenosine Raltitrexed 6-Mercaptopurine Hydroxyurea 6-Thioguanine Decitabine (SuperGen) Cytarabine Clofarabine (Bioenvision) 2-fluorodesoxycytidine Irofulven (MGI Pharma) Methotrexate DMDC (Hoffmann-La Idatrexate Roche) Ethynylcytidine (Taiho) Topoisomerase Amsacrine Rubitecan (SuperGen) inhibitors Epirubicin Exatecan mesylate Etoposide (Daiichi) Teniposide or Quinamed (ChemGenex) mitoxantrone Gimatecan (Sigma-Tau) Irinotecan (CPT-11) Diflomotecan (Beaufour- 7-ethyl-10- Ipsen) hydroxycamptothecin TAS-103 (Taiho) Topotecan Elsamitrucin (Spectrum) Dexrazoxanet J-107088 (Merck & Co) (TopoTarget) BNP-1350 (BioNumerik) Pixantrone (Novuspharma) CKD-602 (Chong Kun Rebeccamycin analogue Dang) (Exelixis) KW-2170 (Kyowa Hakko) BBR-3576 (Novuspharma) Antitumour Dactinomycin (Actinomycin Amonafide antibiotics D) Azonafide Doxorubicin (Adriamycin) Anthrapyrazole Deoxyrubicin Oxantrazole Valrubicin Losoxantrone Daunorubicin Bleomycin sulfate (Daunomycin) (Blenoxan) Epirubicin Bleomycinic acid Therarubicin Bleomycin A Idarubicin Bleomycin B Rubidazon Mitomycin C Plicamycinp MEN-10755 (Menarini) Porfiromycin GPX-100 (Gem Cyanomorpholinodoxorubicin Pharmaceuticals) Mitoxantron (Novantron) Antimitotic agents Paclitaxel SB 408075 Docetaxel (GlaxoSmithKline) Colchicine E7010 (Abbott) Vinblastine PG-TXL (Cell Vincristine Therapeutics) Vinorelbine IDN 5109 (Bayer) Vindesine A 105972 (Abbott) Dolastatin 10 (NCI) A 204197 (Abbott) Rhizoxin (Fujisawa) LU 223651 (BASF) Mivobulin (Warner- D 24851 (ASTA Medica) Lambert) ER-86526 (Eisai) Cemadotin (BASF) Combretastatin A4 (BMS) RPR 109881A (Aventis) Isohomohalichondrin-B TXD 258 (Aventis) (PharmaMar) Epothilone B (Novartis) ZD 6126 (AstraZeneca) T 900607 (Tularik) PEG-Paclitaxel (Enzon) T 138067 (Tularik) AZ10992 (Asahi) Cryptophycin 52 (Eli Lilly) !DN-5109 (Indena) Vinflunine (Fabre) AVLB (Prescient Auristatin PE (Teikoku NeuroPharma) Hormone) Azaepothilon B (BMS) BMS 247550 (BMS) BNP-7787 (BioNumerik) BMS 184476 (BMS) CA-4-prodrug (OXiGENE) BMS 188797 (BMS) Dolastatin-10 (NrH) Taxoprexin (Protarga) CA-4 (OXiGENE) Aromatase Aminoglutethimide Exemestan inhibitors Letrozole Atamestan (BioMedicines) Anastrazole YM-511 (Yamanouchi) Formestan Thymidylate Pemetrexed (Eli Lilly) Nolatrexed (Eximias) synthase ZD-9331 (BTG) CoFactor ™ (BioKeys) inhibitors DNA antagonists Trabectedin (PharmaMar) Mafosfamide (Baxter Glufosfamide (Baxter International) International) Apaziquone (Spectrum Albumin + 32P (Isotope Pharmaceuticals) Solutions) O6-benzylguanine Thymectacin (NewBiotics) (Paligent) Edotreotid (Novartis) Farnesyl Arglabin (NuOncology Tipifarnib (Johnson & transferase Labs) Johnson) inhibitors Ionafarnib (Schering- Perillyl alcohol (DOR Plough) BioPharma) BAY-43-9006 (Bayer) Pump inhibitors CBT-1 (CBA Pharma) Zosuquidar Tariquidar (Xenova) trihydrochloride (Eli Lilly) MS-209 (Schering AG) Biricodar dicitrate (Vertex) Histone acetyl Tacedinaline (Pfizer) Pivaloyloxymethyl butyrate transferase SAHA (Aton Pharma) (Titan) inhibitors MS-275 (Schering AG) Depsipeptide (Fujisawa) Metalloproteinase Neovastat (Aeterna CMT-3 (CollaGenex) inhibitors Laboratories) BMS-275291 (Celltech) Ribonucleoside Marimastat (British Tezacitabine (Aventis) reductase Biotech) Didox (Molecules for inhibitors Gallium maltolate (Titan) Health) Triapin (Vion) TNF-alpha Virulizin (Lorus Revimid (Celgene) agonists/ Therapeutics) antagonists CDC-394 (Celgene) Endothelin-A Atrasentan (Abbot) YM-598 (Yamanouchi) receptor ZD-4054 (AstraZeneca) antagonists Retinoic acid Fenretinide (Johnson & Alitretinoin (Ligand) receptor agonists Johnson) LGD-1550 (Ligand) Immuno- Interferon Dexosome therapy modulators Oncophage (Antigenics) (Anosys) GMK (Progenics) Pentrix (Australian Cancer Adenocarcinoma vaccine Technology) (Biomira) JSF-154 (Tragen) CTP-37 (AVI BioPharma) Cancer vaccine (Intercell) JRX-2 (Immuno-Rx) Norelin (Biostar) PEP-005 (Peplin Biotech) BLP-25 (Biomira) Synchrovax vaccines (CTL MGV (Progenics) Immuno) !3-Alethin (Dovetail) Melanoma vaccine (CTL CLL-Thera (Vasogen) Immuno) p21-RAS vaccine (GemVax) Hormonal and Oestrogens Prednisone antihormonal Conjugated oestrogens Methylprednisolone agents Ethynyloestradiol Prednisolone chlorotrianisene Aminoglutethimide Idenestrol Leuprolide Hydroxyprogesterone Goserelin caproate Leuporelin Medroxyprogesterone Bicalutamide Testosterone Flutamide Testosterone propionate Octreotide Fluoxymesterone Nilutamide Methyltestosterone Mitotan Diethylstilbestrol P-04 (Novogen) Megestrol 2-Methoxyoestradiol Tamoxifen (EntreMed) Toremofin Arzoxifen (Eli Lilly) Dexamethasone Photodynamic Talaporfin (Light Sciences) Pd-Bacteriopheophorbid agents Theralux (Yeda) (Theratechnologies) Lutetium-Texaphyrin Motexafin-Gadolinium (Pharmacyclics) (Pharmacyclics) Hypericin Tyrosine kinase Imatinib (Novartis) Kahalide F (PharmaMar) inhibitors Leflunomide(Sugen/Pharmacia) CEP-701 (Cephalon) ZDI839 (AstraZeneca) CEP-751 (Cephalon) Erlotinib (Oncogene MLN518 (Millenium) Science) PKC412 (Novartis) Canertjnib (Pfizer) Phenoxodiol O Squalamine (Genaera) Trastuzumab (Genentech) SU5416 (Pharmacia) C225 (ImClone) SU6668 (Pharmacia) rhu-Mab (Genentech) ZD4190 (AstraZeneca) MDX-H210 (Medarex) ZD6474 (AstraZeneca) 2C4 (Genentech) Vatalanib (Novartis) MDX-447 (Medarex) PKI166 (Novartis) ABX-EGF (Abgenix) GW2016 IMC-1C11 (ImClone) (GlaxoSmithKline) EKB-509 (Wyeth) EKB-569 (Wyeth) Various agents SR-27897 (CCK-A BCX-1777 (PNP inhibitor, inhibitor, Sanofi- BioCryst) Synthelabo) Ranpirnase (ribonuclease Tocladesine (cyclic AMP stimulant, Alfacell) agonist, Ribapharm) Galarubicin (RNA Alvocidib (CDK inhibitor, synthesis inhibitor, Dong- Aventis) A) CV-247 (COX-2 inhibitor, Tirapazamine (reducing Ivy Medical) agent, SRI International) P54 (COX-2 inhibitor, N-Acetylcysteine (reducing Phytopharm) agent, Zambon) CapCell ™ (CYP450 R-Flurbiprofen (NF-kappaB stimulant, Bavarian Nordic) inhibitor, Encore) GCS-IOO (gal3 antagonist, 3CPA (NF-kappaB GlycoGenesys) inhibitor, Active Biotech) G17DT immunogen Seocalcitol (vitamin D (gastrin inhibitor, Aphton) receptor agonist, Leo) Efaproxiral (oxygenator, 131-I-TM-601 (DNA Allos Therapeutics) antagonist, PI-88 (heparanase TransMolecular) inhibitor, Progen) Eflornithin (ODC inhibitor, Tesmilifen (histamine ILEX Oncology) antagonist, YM Minodronic acid BioSciences) (osteoclast inhibitor, Histamine (histamine H2 Yamanouchi) receptor agonist, Maxim) Indisulam (p53 stimulant, Tiazofurin (IMPDH Eisai) inhibitor, Ribapharm) Aplidin (PPT inhibitor, Cilengitide (integrin PharmaMar) antagonist, Merck KGaA) Rituximab (CD20 antibody, SR-31747 (IL-1 antagonist, Genentech) Sanofi-Synthelabo) Gemtuzumab (CD33 CCI-779 (mTOR kinase antibody, Wyeth Ayerst) inhibitor, Wyeth) PG2 (haematopoiesis Exisulind (PDE-V inhibitor, promoter, Pharmagenesis) Cell Pathways) Immunol ™ (triclosan CP-461 (PDE-V inhibitor, mouthwash, Endo) Cell Pathways) Triacetyluridine (uridine AG-2037 (GART inhibitor, prodrug, Wellstat) Pfizer) SN-4071 (sarcoma agent, WX-UK1 (plasminogen Signature BioScience) activator inhibitor, Wilex) TransMID-107 ™ PBI-1402 (PMN stimulant, (immunotoxin, KS ProMetic LifeSciences) Biomedix) Bortezomib (proteasome PCK-3145 (apoptosis inhibitor, Millennium) promoter, Procyon) SRL-172 (T-cell stimulant, Doranidazole (apoptosis SR Pharma) promoter, Pola) TLK-286 (glutathione-S CHS-828 (cytotoxic agent, transferase inhibitor, Telik) Leo) PT-100 (growth factor Trans-retinic acid agonist, Point (differentiator, NIH) Therapeutics) MX6 (apoptosis promoter, Midostaurin (PKC inhibitor, MAXIA) Novartis) Apomine (apoptosis Bryostatin-1 (PKC promoter, ILEX Oncology) stimulant, GPC Biotech) Urocidin (apoptosis CDA-II (apoptosis promoter, Bioniche) promoter, Everlife) Ro-31-7453 (apoptosis SDX-101 (apoptosis promoter, La Roche) promoter, Salmedix) Brostallicin (apoptosis Ceflatonin (apoptosis promoter, Pharmacia) promoter, ChemGenex)

A combined treatment of this type can be achieved with the aid of simultaneous, consecutive or separate dispensing of the individual components of the treatment. Combination products of this type employ the compounds according to the invention.

Assays

The compounds of the formula I described in the examples were tested by the assays described below and were found to have kinase inhibitory activity. Other assays are known from the literature and could readily be performed by the person skilled in the art (see, for example, Dhanabal et al., Cancer Res. 59:189-197; Xin et al., J. Biol. Chem. 274:9116-9121; Sheu et al., Anticancer Res. 18:4435-4441; Ausprunk et al., Dev. Biol. 38:237-248; Gimbrone et al., J. Natl. Cancer Inst. 52:413-427; Nicosia et al., In Vitro 18:538-549).

Measurement of Met kinase Activity

According to the manufacturer's data (Met, active, upstate, catalogue No. 14-526), Met kinase is expressed for the purposes of protein production in insect cells (Sf21; S. frugiperda) and subsequent affinity-chromatographic purification as “N-terminal 6His-tagged” recombinant human protein in a baculovirus expression vector.

The kinase activity can be measured using various available measurement systems. In the scintillation proximity method (Sorg et al., J. of Biomolecular Screening, 2002, 7, 11-19), the flashplate method or the filter binding test, the radioactive phosphorylation of a protein or peptide as substrate is measured using radioactively labelled ATP (³²P-ATP, ³³P-ATP). In the case of the presence of an inhibitory compound, a reduced radioactive signal, or none at all, can be detected. Furthermore, homogeneous time-resolved fluorescence resonance energy transfer (HTR-FRET) and fluoroescence polarisation (FP) technologies can be used as assay methods (Sills et al., J. of Biomolecular Screening, 2002, 191-214).

Other non-radioactive ELISA assay methods use specific phospho-antibodies (phospho-ABs). The phospho-antibody only binds the phosphorylated substrate. This binding can be detected by chemiluminescence using a second peroxidase-conjugated antibody (Ross et al., 2002, Biochem. J.).

Flashplate Method (Met Kinase)

The test plates used are 96-well Flashplate® microtitre plates from Perkin Elmer (Cat. No. SMP200). The components of the kinase reaction described below are pipetted into the assay plate. The Met kinase and the substrate poly Ala-Glu-Lys-Tyr, (pAGLT, 6:2:5:1), are incubated for 3 hrs at room temperature with radioactively labelled ³³P-ATP in the presence and absence of test substances in a total volume of 100 μl. The reaction is terminated using 150 μl of a 60 mM EDTA solution. After incubation for a further 30 min at room temperature, the supernatants are filtered off with suction, and the wells are washed three times with 200 μl of 0.9% NaCl solution each time. The measurement of the bound radioactivity is carried out by means of a scintillation measuring instrument (Topcount NXT, Perkin-Elmer).

The full value used is the inhibitor-free kinase reaction. This should be approximately in the range 6000-9000 cpm. The pharmacological zero value used is staurosporin in a final concentration of 0.1 mM. The inhibitory values (IC50) are determined using the RS1_MTS program.

Kinase Reaction Conditions Per Well:

30 μl of assay buffer

10 μl of substance to be tested in assay buffer with 10% of DMSO

10 μl of ATP (final concentration 1 μM cold, 0.35 μCi of ³³P-ATP)

50 μl of Met kinase/substrate mixture in assay buffer;

-   -   (10 ng of enzyme/well, 50 ng of pAGLT/well)     -   Solutions Used:         -   Assay buffer:     -   50 mM HEPES         -   3 mM magnesium chloride         -   3 μM sodium orthovanadate         -   3 mM manganese(II) chloride         -   1 mM dithiothreitol (DTT)     -   pH=7.5 (to be set using sodium hydroxide)         -   Stop Solution:     -   60 mM Titriplex III (EDTA)         -   ³³P-ATP: Perkin-Elmer;         -   Met kinase: Upstate, Cat. No. 14-526, Stock 1 μg/10 μl;             spec. activity 954 U/mg;     -   Poly-Ala-Glu-Lys-Tyr, 6:2:5:1: Sigma Cat. No. P1152

In-Vivo Tests (FIG. 1/1)

Experimental Procedure: Female Balb/C mice (breeder: Charles River Wiga) were 5 weeks old on arrival. They were acclimatized to our keeping conditions for 7 days. Each mouse was subsequently injected subcutaneously in the pelvic area with 4 million TPR-Met/NIH3T3 cells in 100 μl of PBS (without Ca++ and Mg++). After 5 days, the animals were randomised into 3 groups, so that each group of 9 mice had an average tumor volume of 110 μl (range: 55-165). 100 μl of vehicle (0.25% methylcellulose/100 mM acetate buffer, pH 5.5) were administered daily to the control group, and 200 mg/kg of “A56” or “A91” dissolved in the vehicle (volume likewise 100 μl/animal) were administered daily to the treatment groups, in each case by gastric tube. After 9 days, the controls had an average volume of 1530 μl and the experiment was terminated.

Measurement of the tumor volume: The length (L) and breadth (B) were measured using a Vernier calliper, and the tumor volume was calculated from the formula L×B×B/2.

Keeping conditions: 4 or 5 animals per cage, feeding with commercial mouse food (Sniff).

The compounds “A18” and “A22” have a significant antitumoral action.

Above and below, all temperatures are indicated in ° C. In the following examples, “conventional work-up” means: water is added if necessary, the pH is adjusted, if necessary, to values between 2 and 10, depending on the constitution of the end product, the mixture is extracted with ethyl acetate or dichloromethane, the phases are separated, the organic phase is dried over sodium sulfate and evaporated; and the residue is purified by chromatography on silica gel and/or by crystallisation. Rf values on silica gel; eluent: ethyl acetate/methanol 9:1.

Mass spectrometry (MS): EI (electron impact ionisation) M⁺

-   -   FAB (fast atom bombardment) (M+H)⁺     -   ESI (electrospray ionisation) (M+H)⁺

APCI-MS (atmospheric pressure chemical ionisation—mass spectrometry) (M+H)⁺.

Mass spectrometry (MS): EI (electron impact ionisation) M⁺

-   -   FAB (fast atom bombardment) (M+H)⁺     -   ESI (electrospray ionisation) (M+H)⁺

APCI-MS (atmospheric pressure chemical ionisation—mass spectrometry) (M+H)⁺.

HPLC Methods:

HPLC/MS Analyses

are carried out in a 3μ Silica-Rod column with a 210 second gradient from 20 to 100% water/acetonitrile/0.01% of trifluoroacetic acid, at a flow rate of 2.2 ml/min, and detection at 220 nm.

HPLC Analyses (Method A)

Column: Chromolith RP18e 100*3 mm

Flow rate: 2 ml/min

Solvent A: H₂O+0.1% of trifluoroacetic acid

Solvent B: acetonitrile+0.1% of trifluoroacetic acid

Gradient 5 min

0-4 min: 99:1→1:99

4-5 min: 1:99-1:99

HPLC Analyses (Method B)

Column: Chromolith RP18e 100*3 mm

Flow rate: 4 ml/min

Solvent A: H₂O+0.05% of HCOOH

Solvent B: acetonitrile+10% of solvent A

Gradient 8 min

0-1 min: 99:1→99:1

1-7 min: 99:1-1:99

7-8 min: 1:99→1:99

Retention time Rt in minutes [min].

EXAMPLE 1

The preparation of 2-[3-(5-bromopyrimidin-2-yl)benzyl]-6-cyclopropyl-2H-pyridazin-3-one (“A1”) and 6-cyclopropyl-2-(3-{5-[1-(2-pyrrolidin-1-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one (“A2”) is carried out analogously to the following scheme:

1.1 A mixture of 16.6 g (180 mmol) of glyoxylic acid monohydrate and 50 ml (535 mmol) of cyclopropyl methyl ketone is heated at 120° C. for two hours with stirring. The reaction mixture is cooled to 40° C., and 70 ml of water and 14 ml of 32% aqueous ammonia solution are added. This mixture is extracted three times with dichloromethane. 8.7 ml (179 mmol) of hydrazinium hydroxide are added to the aqueous phase, and the mixture is heated at reflux for one hour. The reaction mixture is cooled to room temperature. The precipitate formed is filtered off with suction, washed with water and dried in vacuo: 6-cyclopropyl-2H-pyridazin-3-one as colourless crystals; ESI 137.

1.2 A solution of 318 g (3.00 mmol) of sodium carbonate in 1.5 l of water is added to a solution, kept under nitrogen, of 427 g (1.50 mol) of 5-bromo-2-iodopyrimidine in 1.5 l of toluene. This mixture is warmed to 80° C., and 34.7 g (30 mmol) of tetrakis(triphenylphosphine)palladium and a solution of 228 g (1.50 mol) of 3-(hydroxymethyl)benzeneboronic acid in 3 l of ethanol are added. The reaction mixture is subsequently heated at reflux for 18 hours. The reaction mixture is cooled to room temperature, filtered and partitioned between water and tent-butyl methyl ether. The organic phase is dried over sodium sulfate and concentrated to a volume of 1 l. The precipitate formed is filtered off with suction and washed with toluene: [3-(5-bromopyrimidin-2-yl)-phenyl]methanol as colourless crystals; ESI 265, 267.

1.3 A solution, kept under nitrogen, of 2.23 g (8.41 mmol) of [3-(5-bromo-pyrimidin-2-yl)phenyl]methanol, 1.49 g (10.9 mmol) of 6-cyclopropyl-2H-pyridazin-3-one and 3.34 g (12.6 mmol) of triphenyiphosphine in 80 ml of THF is cooled in an ice bath, and 2.61 ml (12.6 mmol) of diisopropyl azodicarboxylate (DIAD) are slowly added dropwise. The reaction mixture is stirred at room temperature for 2 hours and evaporated. The residue is chromatographed on a silica-gel column with dichloromethane/methanol as eluent. The product-containing fractions are combined, evaporated and recrystallised from isopropanol: 2-[3-(5-bromopyrimidin-2-yl)benzyl]-6-cyclopropyl-2H-pyridazin-3-one (“A1”) as colourless crystals; ESI 383, 385;

¹H-NMR (DMSO-d₆): δ [ppm] 0.80 (m, 2H), 0.93 (m, 2H), 1.96 (m, 1H), 5.26 (s, 2H), 6.91 (d, J=9.5 Hz, 1H), 7.29 (d, J=9.5 Hz, 1H), 7.46 (dt, J₁=7.5 Hz, J₂=1 Hz, 1H), 7.51 (t, J=7.5 Hz, 1H), 8.27 (dt, J₁=7.5 Hz, J₂=1 Hz, 1H), 8.30 (t, J=1 Hz, 1H), 9.07 (s, 2H).

1.4 15.0 g (86.7 mmol) of N-(2-chloroethyl)pyrrolidine hydrochloride and 42.4 g (130 mmol) of caesium carbonate are added to a solution of 8.58 g (43.3 mmol) of pinacolyl pyrazole-4-boronate in 86 ml of acetonitrile, and the suspension formed is stirred at room temperature for 18 hours. The reaction mixture is filtered, and the residue is washed with acetonitrile. The filtrate is evaporated, and the residue is partitioned between saturated sodium chloride solution and ethyl acetate. The organic phase is dried over sodium sulfate and evaporated: 10.9 g of 1-(2-pyrrolidin-1-ylethyl)-4-(4,4,5,5-tetra-methyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole as yellow oil; ESI 292.

1.5 425 mg (2.0 mmol) of tripotassium phosphate trihydrate and 56.2 mg (0.08 mmol) of bis(triphenylphosphine)palladium chloride are added to a solution, kept under nitrogen, of 394 mg (1.00 mmol) of 2-[3-(5-bromo-pyrimidin-2-yl)benzl]-6-cyclopropyl-2H-pyridazin-3-one and 337 mg (1.10 mmol) of 1-(2-pyrrolidin-1-ylethyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxa-borolan-2-yl)-1H-pyrazole in 10 ml of 1,2-dimethoxyethane, and the mixture is stirred at 80° C. for 18 hours. The reaction mixture is filtered through kieselguhr and washed with dichloromethane. The filtrate is evaporated, and the residue is chromatographed on a silica-gel column with dichloromethane/-methanol as eluent: 6-cyclopropyl-2-(3-{5-[1-(2-pyrrolidin-1-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one (“A2”) as colourless oil; ESI 468;

¹H-NMR (DMSO-d₆): δ [ppm] 0.82 (m, 2H), 0.95 (m, 2H), 1.68 (m, 4H), 1.98 (m, 1H), 2.51 (m, 4H), 2.88 (t, J=6.8 Hz, 2H), 4.28 (t, J=6.8 Hz, 2H), 5.28 (s, 2H), 6.93 (d, J=9.5 Hz, 1H), 7.31 (d, J=9.5 Hz, 1H), 7.42 (d, J=7.5 Hz, 1H), 7.50 (t, J=7.5 Hz, 1H), 8.11 (s, 1H), 8.31 (d, J=7.5 Hz, 1H), 8.33 (bs, 1H), 8.45 (s, 1H), 9.14 (s, 2H).

The following compounds are obtained analogously:

6-cyclopropyl-2-(3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]-pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one

ESI 484;

6-cyclobutyl-2-(3-{5-[1-(2-pyrrolidin-1-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one

¹H-NMR (d₆-DMSO): δ [ppm] 1.67 (m, 4H), 1.83 (m, 1H), 1.97 (m, 1H), 2.21 (m, 4H), 2.49 (m, 4H), 2.87 (t, J=6.8 Hz, 2H), 3.50 (quintet, J=8.5 Hz, 1H), 4.26 (t, J=6.8 Hz, 2H), 5.32 (s, 2H), 6.96 (d, J=9.5 Hz, 1H), 7.43 (d, J=7.5 Hz, 1H), 7.45 (d, J=9.5 Hz, 1H), 7.50 (t, J=7.5 Hz, 1H), 8.10 (s, 1H), 8.30 (d, J=7.5 Hz, 1H), 8.36 (bs, 1H), 8.44 (s, 1H), 9.12 (s, 2H).

EXAMPLE 2

The preparation of 6-cyclopropyl-2-[3-(5-methylpyrimidin-2-yl)benzyl]-2H-pyridazin-3-one (“A4”) is carried out analogously to the following scheme:

2.1 1.31 ml (11.0 mmol) of 3-ethoxymethacrolein and 2.04 ml (11.0 mmol) of a 30% solution of sodium ethoxide in methanol are added to a suspension of 2.41 g (10.0 mmol) of methyl 3-carbamimidoylbenzoate acetate in 40 ml of methanol, and the resultant solution is stirred at 50° C. for 18 hours. The reaction mixture is evaporated in vacuo, and water is added. The precipitate formed is filtered off with suction, washed with water and dried in vacuo: methyl 3-(5-methylpyrimidin-2-yl)benzoate as colourless crystals; ESI 229.

2.2 600 mg (5.41 mmol) of powdered calcium chloride are added to a suspension of 400 mg (10.6 mmol) of sodium borohydride in 20 ml of THF, and the mixture is stirred at room temperature for 1.5 hours. A solution of 751 mg (3.29 mmol) of methyl 3-(5-methylpyrimidin-2-yl)benzoate in 10 ml of THF is added dropwise to this suspension with stirring, and the mixture is stirred at room temperature for 18 hours. 10 ml of 1 N NaOH, water and dichloromethane are added to the reaction mixture, which is then filtered. The organic phase of the filtrate is separated off, dried over sodium sulfate and evaporated. The residue is chromatographed on a silica-gel column with dichloromethane/methanol as eluent: [3-(5-methylpyrimidin-2-yl)phenyl]-methanol as colourless solid; ESI 201.

2.3 147 μl (0.75 mmol) of diisopropyl diazodicarboxylate are added dropwise to a solution of 68.1 mg (0.50 mmol) of 6-cyclopropyl-2H-pyridazin-3-one, 100 mg (0.50 mmol) of [3-(5-methylpyrimidin-2-yl)phenyl]methanol and 197 mg (0.75 mmol) of triphenylphosphine in 3 ml of THF, and the resultant solution is stirred at room temperature for 18 hours. The reaction mixture is evaporated in vacua, and the residue is chromatographed on a silica-gel column with dichloromethane/methanol as eluent: 6-cyclopropyl-2-[3-(5-methyl-pyrimidin-2-yl)benzyl]-2H-pyridazin-3-one (“A4”) as colourless solid; ESI 319.

EXAMPLE 3

The preparation of 6-cyclopropyl-2-{3-[5-(1-piperidin-4-yl-1H-pyrazol-4-yl)-pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one (“A5”) is carried out analogously to the following scheme:

3.1 637 mg (3.0 mmol) of tripotassium phosphate trihydrate and 84.2 mg (0.12 mmol) of bis(triphenylphosphine)palladium chloride are added to a solution, kept under nitrogen, of 599 mg (1.50 mmol) of 2-[3-(5-bromopyrimidin-2-yl)benzyl]-6-cyclopropyl-2H-pyridazin-3-one and 623 mg (1.65 mmol) of tert-butyl 4-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazol-1-yl]-piperidine-1-carboxylate (prepared as described in WO 2007/066187) in 15 ml of 1,2-dimethoxyethane, and the mixture is stirred at 80° C. for 18 hours. The reaction mixture is filtered through kieselguhr and washed with dichloromethane. The filtrate is washed with water. The organic phase is dried over sodium sulfate and evaporated. The residue is chromatographed on a silica-gel column with dichloromethane/methanol as eluent: tert-butyl 4-(4-{2-[3-(3-cyclopropyl-6-oxo-6H-pyridazin-1-ylmethyl)phenyl]pyrimidin-5-yl}pyrazol-1-yl)piperidine-1-carboxylate as yellowish high-viscosity oil; ESI 554.

3.2 2 ml of methanol are added to a suspension of 692 mg (1.24 mmol) of tert-butyl 4-(4-{2-[3-(3-cyclopropyl-6-oxo-6H-pyridazin-1-ylmethyl)phenyl]-pyrimidin-5-yl}pyrazol-1-yl)piperidine-1-carboxylate in 5 ml of 4 N HCl in dioxane, and the mixture is heated at 80° C. for 5 minutes. The reaction mixture is evaporated, and water, dichloromethane and saturated sodium hydrogencarbonate solution are added successively. The organic phase is separated off, dried over sodium sulfate and evaporated. The residue is recrystallised from tert-butyl methyl ether: 6-cyclopropyl-2-{3-[5-(1-piperidin-4-yl-1H-pyrazol-4-yl)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one (“A5”) as colourless crystals; ESI 454;

¹H-NMR (DMSO-d₆): δ [ppm] 0.81 (m, 2H), 0.94 (m, 2H) 1.80 (m, 2H), 1.99 (m, 3H), 2.60 (m, 2H), 3.05 (m, 2H), 4.23 (m, 1H), 5.27 (s, 2H), 6.92 (d, J=9.5 Hi, 1H), 7.30 (d, J=9.5 Hz, 1H), 7.41 (d, J=7.5 Hz, 1H), 7.49 (t, J=7.5 Hz, 1H), 8.10 (s, 1H), 8.30 (d, J=7.5 Hz, 1H), 8.33 (bs, 1H), 8.48 (s, 1H), 9.14 (s, 2H).

The compound

6-methyl-2-{3-[5-(1-piperidin-4-yl-1H-pyrazol-4-yl)pyrimidin-2-yl]benzl}-2H-pyridazin-3-one

ESI 428 is obtained analogously.

EXAMPLE 4

The preparation of 6-cyclopropyl-2-[3-(5-methyl-1,2,4-oxadiazol-3-yl)benzyl]-2H-pyridazin-3-one (“A7”) is carried out analogously to the following scheme:

169 mg (1.0 mmol) of caesium carbonate are added to a solution of 68.1 mg (0.50 mol) of 6-cyclopropyl-2H-pyridazin-3-one and 126.5 mg (0.50 mmol) of 3-(3-bromomethylphenyl)-5-methyl-1,2,4-oxadiazole (prepared as described by W. W. K. R. Mederski et al., Tetrahedron 55, 1999, 12757-12770) in 1 ml of dimethylformamide (DMF), and the suspension formed is stirred at room temperature for 18 hours. Water and tert-butyl methyl ether are added to the reaction mixture. The organic phase is separated off, dried over sodium sulfate and evaporated. The residue is chromatographed on a silica-gel column with dichloromethane/methanol as eluent: 6-cyclopropyl-2-[3-(5-methyl-1,2,4-oxadiazol-3-yl)benzyl]-2H-pyridazin-3-one (“A7”) as colourless crystals; ESI 309.

EXAMPLE 5

The preparation of 6-cyclopropyl-2-{3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one (“A8”) is carried out analogously to the following scheme:

5.1 1382 g (10.0 mol) of potassium carbonate are added in portions with stirring to a suspension, held at 30° C., of 500 g (3.40 mol) of 3-cyanobenzoic acid in 8 l of methanol 695 g (10.0 mol) of hydroxylammonium chloride are subsequently added in small portions at an internal temperature of 40 to 45° C. The reaction mixture is then heated at the boil for 15 hours. The reaction mixture is evaporated in vacua, dissolved in water and acidified using 37% aqueous hydrochloric acid. The precipitate formed is filtered off with suction, washed with water and dried in vacua: 3-(N-hydroxycarbamimidoyl)-benzoic acid as colourless crystals; ESI 181.

5.2 A mixture of 614 g (3.41 mol) of 3-(N-hydroxycarbamimidoyl)benzoic acid, 756 ml (8.0 mol) of acetic anhydride and 2 l of acetic acid is heated at a temperature of 118° C. for 14 hours. The reaction mixture is cooled to 6° C. and filtered with suction. The residue is taken up in 2 l of water, filtered off with suction and washed well with water. The residue is recrystallised from ethanol/water: 3-(5-methyl-1,2,4-oxadiazol-3-yl)benzoic acid as colourless crystals; m. p. 225° C.; ESI 205.

5.3 7.83 ml (147 mmol) of concentrated sulfuric acid are added to a suspension of 30.0 g (147 mmol) of 3-(5-methyl-1,2,4-oxadiazoi-3-yl)benzoic acid in 150 ml of methanol, and the mixture is heated at the boil for 18 hours. The reaction mixture is cooled in an ice bath, water is added, and the product is filtered off with suction and washed well with water: methyl 3-(5-methyl-1,2,4-oxadiazol-3-yl)benzoate as colourless crystals; ESI 219.

5.4 150 ml of acetic acid, 150 ml of water and 50 g of water-moist Raney nickel are added to a solution of 327 g (1.47 mol) of methyl 3-(5-methyl-1,2,4-oxadiazol-3-yl)benzoate in 3 l of methanol, and the mixture is hydrogenated at room temperature and atmospheric pressure for 18 hours. The catalyst is filtered off, and the filtrate is evaporated. The residue is taken up in tert-butyl methyl-ether, heated to the boil and filtered off with suction. The residue is dried in vacuo: 3-methoxycarbonylbenzamidinium acetate as colourless crystals; ESI 179.

5.5 2.2 l of a freshly prepared 1.5 M sodium methoxide solution are added dropwise with stirring to a suspension of 259 g (1.09 mol) of 3-methoxycarbonylbenzamidinium acetate and 528 g (1.08 mol) of ({2-dimethylamino-1-[dimethylimmoniomethyl]vinylamino}methylene)dimethyl-ammonium dihexafluorophosphate (prepared as described by C. B. Dousson et al., Synthesis 2005, 1817) in 1 l of methanol. The reaction mixture is then warmed to 60° C. over the course of 40 min and held at this temperature for 30 min. The reaction mixture is then cooled to room temperature, diluted with 10 l of dichloromethane and washed three times with 5 l of water each time. The organic phase is dried over sodium sulfate and evaporated. The residue is recrystallised from ethyl acetate: methyl 3-[5-(dimethylaminomethylene-amino)pyrimidin-2-yl]benzoate as beige crystals; m.p. 140° C., ESI 285.

5.6 160 ml (2.88 mol) of concentrated sulfuric acid are added to a suspension of 103.5 g (364 mmol) of methyl 3-[5-(dimethylaminomethylene-amino)pyrimidin-2-yl]benzoate in 1.3 l of water, and the mixture is heated at the boil for 4 hours. The reaction mixture is cooled to room temperature, diluted with water and filtered with suction. The residue is washed with water and dried in vacua: 3-(5-hydroxypyrimidin-2-yl)benzoic acid as brownish crystals; ESI 217.

5.7 32.7 ml (445 mmol) of thionyl chloride are added to a suspension of 88.0 g (366 mmol) of 3-(5-hydroxypyrimidin-2-yl)benzoic acid in 1.4 l of methanol, and the mixture is heated at 80° C. for 2 hours. 20 ml (276 mmol) of thionyl chloride and a further 10 ml (138 mmol) of thionyl chloride are then added. After each addition, the reaction mixture is stirred at 80° C. for 2 hours. The reaction mixture is concentrated to a volume of approx. 300 ml in vacuo, and the precipitate formed is filtered off and dried in vacuo: methyl 3-(5-hydroxypyrimidin-2-yl)benzoate as brownish crystals; ESI 231.

5.8 A solution, kept under nitrogen, of 6.1 g (26.5 mmol) of methyl (5-hydroxypyrimidin-2-yl)benzoate, 10.5 g (39.8 mmol) of triphenylphosphine and 4.76 ml (39.8 mmol) of 3-(dimethylamino)-1-propanol in 200 ml of THF is cooled in an ice bath, and 8.21 ml (39.8 mmol) of diisopropyl azodicarboxylate are slowly added dropwise with stirring. After the reaction mixture has been stirred at room temperature for 2 hours, it is evaporated in vacuo. The residue is partitioned between dichloromethane and saturated aqueous potassium hydrogensulfate solution. The aqueous phase is separated off, adjusted to a pH of 12 using saturated aqueous sodium hydroxide solution and extracted twice with dichloromethane. The organic phase is dried over sodium sulfate and evaporated. The residue is chromatographed on a silica-gel column with dichloromethane/methanol as eluent: methyl 3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]benzoate as colourless crystals; ESI 316.

5.9 200 ml of a 1 M solution of diisobutylaluminium hydride in THF are added dropwise with stirring to a solution, kept under nitrogen, of 12.6 g (40.0 mmol) of methyl 3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]benzoate in 200 ml of THF. After the mixture has been stirred at room temperature for 1 hour, 10 ml of a saturated aqueous sodium sulfate solution are added dropwise. The precipitate formed is filtered off with suction and washed with dichloromethane. The filtrate is dried over sodium sulfate and evaporated. The residue is taken up in a mixture of diethyl ether and petroleum ether. The precipitate formed is filtered off with suction, washed with petroleum ether and dried in vacuo: {3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]-phenyl}methanol as colourless crystals; m.p. 95-97° C.; ESI 288.

5.10 A suspension of 144 mg (0.50 mmol) of {3-[5-(3-dimethylamino-propoxy)pyrimidin-2-yl]phenyl}methanol, 88.5 mg (0.65 mmol) of 6-cyclopropyl-2H-pyridazin-3-one and 199 mg (0.75 mmol) of triphenylphosphine in 1 ml of THF is cooled in an ice bath, and 160 mg (0.75 mmol) of diisopropyl azodicarboxylate are slowly added dropwise. After the mixture has been stirred at room temperature for 1 hour, ethyl acetate and 2 N aqueous hydrochloric acid are added. The aqueous phase is separated off and washed three times with ethyl acetate. The aqueous phase is adjusted to a pH of 14 using 2 N sodium hydroxide solution and extracted twice with ethyl acetate. The organic phase is dried over sodium sulfate and evaporated. The residue is purified by preparative HPLC. The product-containing fractions are evaporated, dissolved in 0.5 ml of 1 N aqueous hydrochloric acid and a little water and lyophilised: 6-cyclopropyl-2-{3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one (“A8”) hydrochloride as colourless glass; ESI 406;

¹H-NMR (DMSO-d₆): δ [ppm] 0.80 (m, 2H), 0.93 (m, 2H), 1.96 (m, 1H), 2.21 (m, 2H), 2.78 (d, J=5 Hz, 6H), 3.22 (m, 2H), 4.31 (t, J=6 Hz, 2H), 5.25 (s, 2H), 6.91 (d, J=9.5 Hz, 1H), 7.29 (d, J=9.5 Hz, 1H), 7.37 (d, J=7.5 Hz, 1H), 7.46 (t, J=7.5 Hz, 1H), 8.22 (d, J=7.5 Hz, 1H), 8.25 (bs, 1H), 8.65 (s, 2H), 10.57 (bs, 1H).

The following compounds are obtained analogously:

6-cyclopropyl-2-{3-[5-(1-methylpiperidin-4-yloxy)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one

ESI 418;

2-{3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]benzyl}-6-isopropyl-2H-pyridazin-3-one formate

ESI 408;

6-cyclopropyl-2-{3-[5-(piperidin-4-yloxy)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one (preparation via the Boc-protected compound)

ESI 404;

6-cyclobutyl-2-{3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one

6-cyclopropyl-2-{3-[5-(2-morpholin-4-ylethoxy)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one

EXAMPLE 6

The preparation of 6-cyclopropyl-2-{3-[5-(4-methylpiperazin-1-yl)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one (“A12”) is carried out analogously to the following scheme:

6.1 A solution of 30 g (215 mmol) of potassium carbonate in 500 ml of water is added to a solution of 23.3 g (82.1 mmol) of methyl 3-[5-(dimethyl-aminomethyleneamino)pyrimidin-2-yl]benzoate in 300 ml of dioxane, and the mixture is stirred at 100° C. for 12 hours. The reaction mixture is cooled to room temperature, and a pH of 6-7 is set using 35 ml of 37% aqueous hydrochloric acid. The solution is substantially evaporated in vacuo and lyophilised (crude 3-(5-aminopyrimidin-2-yl)benzoic acid; ESI 216). 400 ml of methanol are added to the residue, and 26 ml of concentrated sulfuric acid are added dropwise to the resultant suspension with ice-cooling. The reaction mixture is stirred at room temperature for 6 hours, 500 ml of water are then added, and 32% aqueous sodium hydroxide solution is added with ice-cooling until a basic pH has been reached. The mixture is extracted with ethyl acetate. The organic phase is dried over sodium sulfate and evaporated: methyl 3-(5-aminopyrimidin-2-yl)benzoate as brown solid; ESI 230.

6.2 2.59 g (1.7 mmol) of potassium carbonate and 3.6 g (1.7 mmol) of bis(2-chloroethyl)methylammonium chloride are added to a solution of 2.50 g (10.9 mmol) of methyl 3-(5-aminopyrimidin-2-yl)benzoate in 10 ml of 1-methyl-2-pyrrolidone, and the suspension is stirred under argon at 120° C. for 18 hours and at 140° C. for 6 hours. The reaction mixture is cooled to room temperature, 150 ml of water are added, and the mixture is filtered through kieselguhr. The filtrate is adjusted to a pH of 14 using 32% sodium hydroxide solution and extracted twice with ethyl acetate. The combined organic phases are dried over sodium sulfate and evaporated: methyl 3-[5-(4-methyl-piperazin-1-yl)pyrimidin-2-yl]benzoate as brown oil; ESI 313.

6.3 13.8 ml of a 1 M solution of diisobutylaluminum hydride in THF are added dropwise at room temperature to a solution, kept under argon, of 860 mg (2.75 mmol) of methyl 3-[5-(4-methylpiperazin-1-yl)pyrimidin-2-yl]-benzoate in 16 ml of THF. 3 ml of saturated sodium sulfate solution and dichloromethane are added to the reaction mixture. The precipitate formed is filtered off with suction and washed with dichloromethane. The filtrate is dried over sodium sulfate and evaporated: {3-[5-(4-methylpiperazin-1-yl)pyrimidin-2-yl]phenyl}methanol as yellow solid; ESI 285.

6.4 402 mg (corresponds to 1.2 mmol) of polymer-bound triphenylphosphine and 277 mg (1.20 mmol) of di-tert-butyl azodicarboxylate are added to a solution, kept under argon, of 54.7 mg (0.402 mmol) of 6-cyclopropyl-2H-pyridazin-3-one and 114 mg (0.402 mmol) of {3-[5-(4-methylpiperazin-1-yl)-pyrimidin-2-yl]phenyl}methanol in 3 ml of THF and 1 ml of DMF, and the mixture is stirred at room temperature for 3 hours. The reaction mixture is filtered through kieselguhr with suction. The filtrate is evaporated and purified by preparative HPLC: 6-cyclopropyl-2-{3-[5-(4-methylpiperazin-1-yl)pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one (“A12”) bistrifluoroacetate as colourless oil; ESI 403.

EXAMPLE 7

The preparation of 6-isopropyl-2-(3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one (“A13”) is carried out analogously to the following scheme:

7.1 A mixture of 14.4 g (157 mmol) of glyoxylic acid monohydrate and 50 ml (464 mmol) of isopropyl methyl ketone is heated at 120° C. with stirring for two hours. The reaction mixture is cooled to 40° C., and 70 ml of water and 12 ml of 32% aqueous ammonia solution are added. This mixture is extracted three times with dichloromethane. 7.55 ml (155 mmol) of hydrazinium hydroxide are added to the aqueous phase, and the mixture is heated at reflux for 18 hours. The reaction mixture is cooled to room temperature and extracted with dichloromethane. The organic phase is dried over sodium sulfate and evaporated. The residue is chromatographed on a silica-gel column with petroleum ether/tert-butyl methyl ether as eluent, giving 4-hydroxy-5,5,6-trimethyl-4,5-dihydro-2H-pyridazin-3-one as colourless crystals (ESI 157) and 6-isopropyl-2H-pyridazin-3-one as colourless crystals (ESI 139).

The following is likewise prepared by this method: 6-cyclobutyl-2H-pyridazin-3-one.

7.2 425 g (20.0 mmol) of tripotassium phosphate trihydrate and 842 mg (1.2 mmol) of bis(triphenylphosphine)palladium chloride are added to a solution, kept under nitrogen, of 2.65 g (10.0 mol) of [3-(5-bromopyrimidin-2-yl)-phenyl]methanol and 3.38 g (11.0 mmol) of 4-{2-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazol-1-yl]ethyl}morpholine in 50 ml of 1,2-dimethoxyethane, and the mixture is stirred at 80° C. for 18 hours. Dichloromethane and water are added to the reaction mixture, which is then filtered through kieselguhr, and the residue is washed with dichloromethane. The organic phase is separated off, dried over sodium sulfate and evaporated. The residue is recrystallised from 2-propanol, giving (3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}phenyl)methanol as yellowish crystals; ESI 366.

7.3 A solution, kept under nitrogen, of 324 mg (0.70 mmol) of (3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}phenyl)methanol, 131 mg (0.91 mmol) of 6-isopropyl-2H-pyridazin-3-one and 278 mg (1.05 mmol) of triphenylphosphine in 1.4 ml of THF is cooled in an ice bath, and 217 μl (1.056 mmol) of diisopropyl azodicarboxylate are added dropwise. After the reaction mixture has been stirred at room temperature for 2 hours, it is evaporated. The residue is chromatographed on a silica-gel column with dichloromethane/methanol as eluent, giving 6-isopropyl-2-(3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one (“A13”) as yellowish crystals; ESI 486;

¹H-NMR (DMSO-d₆): δ [ppm] 1.20 (d, J=7 Hz, 6H), 2.44 (m, 4H), 2.77 (t, J=6.5 Hz, 2H), 2.90 (septet, J=7 Hz, 1H), 3.57 (m, 4H), 4.30 (t, J=6.5 Hz, 2H), 5.31 (s, 2H), 6.97 (d, J=9.3 Hz, 1H), 7.44 (d, J=7.5 Hz, 1H), 7.50 (t, J=7.5 Hz, 1H), 7.51 (d, J=9.3 Hz, 1H), 8.11 (s, 1H), 8.31 (d, J=7.5 Hz, 1H), 8.36 (bs, 1H), 8.44 (s, 1H), 9.13 (s, 2H).

The following compound is obtained analogously:

2-(3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one (“A14”) trifluoroacetate

ESI 444.

EXAMPLE 8

The preparation of 2-[3-(5-aminopyrimidin-2-yl)benzyl]-6-cyclopropyl-2H-pyridazin-3-one (“A18”) is carried out analogously to the following scheme. The individual reaction steps are carried out analogously to corresponding reactions in Examples 5 and 6:

Pharmacological Data

TABLE 1 Met kinase inhibition (enzyme assay and/or cell assay) IC₅₀ IC₅₀ Compound No. (enzyme) (cell) “A1” A B “A2” A A “A3” A A “A4” A B “A5” A A “A6” A B “A7” B C “A8” A A “A9” A A “A10” A B “A11” A B “A12” A A “A13” A B “A14” A B “A15” A A “A18” B B IC₅₀: 1 nM-0.1 μM = A 0.1 μM-10 μM = B >10 μM = C

The following examples relate to medicaments:

EXAMPLE A Injection Vials

A solution of 100 g of an active ingredient of the formula I and 5 g of disodium hydrogenphosphate in 3 l of bidistilled water is adjusted to pH 6.5 using 2 N hydrochloric acid, sterile filtered, transferred into injection vials, lyophilised under sterile conditions and sealed under sterile conditions. Each injection vial contains 5 mg of active ingredient.

EXAMPLE B Suppositories

A mixture of 20 g of an active ingredient of the formula I with 100 g of soya lecithin and 1400 g of cocoa butter is melted, poured into moulds and allowed to cool. Each suppository contains 20 mg of active ingredient.

EXAMPLE C Solution

A solution is prepared from 1 g of an active ingredient of the formula I, 9.38 g of NaH₂PO₄.2H₂O, 28.48 g of Na₂HPO₄.12H₂O and 0.1 g of benzalkonium chloride in 940 ml of bidistilled water. The pH is adjusted to 6.8, and the solution is made up to 1 l and sterilised by irradiation. This solution can be used in the form of eye drops.

EXAMPLE D Ointment

500 mg of an active ingredient of the formula I are mixed with 99.5 g of Vaseline under aseptic conditions.

EXAMPLE E Tablets

A mixture of 1 kg of active ingredient of the formula I, 4 kg of lactose, 1.2 kg of potato starch, 0.2 kg of talc and 0.1 kg of magnesium stearate is pressed in a conventional manner to give tablets in such a way that each tablet contains 10 mg of active ingredient.

EXAMPLE F Dragees

Tablets are pressed analogously to Example E and subsequently coated in a conventional manner with a coating of sucrose, potato starch, talc, tragacanth and dye.

EXAMPLE G Capsules

2 kg of active ingredient of the formula I are introduced into hard gelatine capsules in a conventional manner in such a way that each capsule contains 20 mg of the active ingredient.

EXAMPLE H Ampoules

A solution of 1 kg of active ingredient of the formula I in 60 l of bidistilled water is sterile filtered, transferred into ampoules, lyophilised under sterile conditions and sealed under sterile conditions. Each ampoule contains 10 mg of active ingredient. 

The invention claimed is:
 1. A compound of formula I

in which R¹ denotes H or A, R² denotes an unsaturated, saturated or aromatic 5- or 6-membered heterocycle having 1 to 4 N, O and/or S atoms, which is unsubstituted or mono-, di- or trisubstituted by Hal, A, [C(R³)₂]_(n)OR³, N═CR³N(R³)₂, SR³, NO₂, CN, COOR³, CON(R³)₂, NR³COA, NR³SO₂A, SO₂N(R³)₂, S(O)_(m)A, [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂, O[C(R³)₂]_(n)Het, S[C(R³)₂]_(n)N(R³)₂, S[C(R³)₂]_(n)Het, NR³[C(R³)₂]_(n)N(R³)₂, NR³[C(R³)₂]_(n)Het, NHCON(R³)₂, NHCONH[C(R³)₂]_(n)N(R³)₂, NHCONH[C(R³)₂]_(n)Het, [C(R³)₂]_(n)NHCO[C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)NHCO[C(R³)₂]_(n)Het, CON(R³)₂, CONR³[C(R³)₂]_(n)N(R³)₂, CONR³[C(R³)₂]_(n)NR³COOA, CONR³[C(R³)₂]_(n)OR³, CONR³[C(R³)₂]_(n)Het, COHet, COA and/or ═O, R³ denotes H or A, R⁴, R⁴′ each, independently of one another, denote H, Hal, A, OR³, CN, COOR³, CON(R³)₂, NR³COA, NR³SO₂A, SO₂N(R³)₂ or S(O)_(m)A, Ar denotes phenyl, naphthyl or biphenyl, which is unsubstituted or mono-, di- or trisubstituted by Hal, A, [C(R³)₂]_(n)OR³, [C(R³)₂]_(n)N(R³)₂, SR³, NO₂, CN, COOR³, CON(R³)₂, NR³COA, NR³SO₂A, SO₂N(R³)₂, S(O)_(m)A, CO-Het, Het, O[C(R³)₂]_(n)—N(R³)₂, O[C(R³)₂]_(n)Het, NHCOOA, NHCON(R³)₂, NHCOO[C(R³)₂]_(n)N(R³)₂, NHCOO[C(R³)₂]_(n)Het, NHCONH[C(R³)₂]_(n)N(R³)₂, NHCONH[C(R³)₂]_(n)Het, OCONH[C(R³)₂]₁N(R³)₂, OCONH[C(R³)₂]_(n)Het, CONR³[C(R³)₂]_(n)N(R³)₂, CONR³[C(R³)₂]_(n)Het and/or COA, Het denotes a mono-, bi- or tricyclic saturated, unsaturated or aromatic heterocycle having 1 to 4 N, O and/or S atoms, which is unsubstituted or mono-, di- or trisubstituted by Hal, A, [C(R³)₂]_(n)OR³, [C(R³)₂]_(n)N(R³)₂, SR³, NO₂, CN, COOR^(S), CON(R³)₂, NR³COA, NR³SO₂A, SO₂N(R³)₂, S(O)_(m)A, CO-Het¹, [C(R³)₂]_(n)Het¹, O[C(R³)₂]_(n)N(R³)₂, O[C(R³)₂]_(n)Het¹, NHCOOA, NHCON(R³)₂, NHCOO[C(R³)₂]_(n)N(R³)₂, NHCOO[C(R³)₂]_(n)Het¹, NHCONH[C(R³)₂]_(n)N(R³)₂, NHCONH[C(R³)₂]_(n)Het¹, OCONH[C(R³)₂]_(n)N(R³)₂, OCONH[C(R³)₂]_(n)Het¹, CO-Het¹, CHO, COA, ═S, ═NH, ═NA and/or ═O, Het¹ denotes a monocyclic saturated heterocycle having 1 to 2 N and/or O atoms, which is unsubstituted or mono- or disubstituted by A, OA, OH, Hal and/or ═O, A denotes unbranched or branched alkyl having 1-10 C atoms, in which 1-7 H atoms are optionally replaced by F and/or in which one or two non-adjacent CH₂ groups are optionally replaced by O, NH, S, SO, SO₂ and/or by CH═CH groups, or cyclic alkyl having 3-7 C atoms, Hal denotes F, Cl, Br or I, m denotes 0, 1 or 2, and n denotes 0, 1, 2, 3 or 4, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 2. A compound according to claim 1, in which R² denotes an unsaturated or aromatic 5- or 6-membered heterocycle having 1 to 4 N and/or O atoms, which is unsubstituted or mono-, di- or trisubstituted by Hal, A, [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ and/or O[C(R³)₂]_(n)Het, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 3. A compound according to claim 1, in which R⁴, R⁴′ denote H, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 4. A compound according to claim 1, in which Het denotes a monocyclic saturated, unsaturated or aromatic heterocycle having 1 to 4 N, O and/or S atoms, which is unsubstituted or mono-, di- or trisubstituted by A and/or [C(R³)₂]_(n)Het¹, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 5. A compound according to claim 1, in which A denotes unbranched or branched alkyl having 1-8 C atoms, in which 1-7 H atoms are optionally replaced by F, or cyclic alkyl having 3-7 C atoms, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 6. A compound according to claim 1, in which R³ denotes H, methyl, ethyl or propyl, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 7. A compound according to claim 1, in which Het¹ denotes a monocyclic saturated heterocycle having 1 to 2 N and/or O atoms, which are optionally mono- or disubstituted by A and/or ═O, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 8. A compound according to claim 1, in which R² denotes furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl or thiadiazolyl, which is monosubstituted by Hal, A, [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ or O[C(R³)₂]_(n)Het, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 9. A compound according to claim 1, in which Het denotes piperidinyl, piperazinyl, pyrrolidinyl, morpholinyl, furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl, thiadiazolyl, pyridazinyl or pyrazinyl, which is monosubstituted by A or [C(R³)₂]_(n)Het¹, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 10. A compound according to claim 1, in which Het¹ denotes pyrrolidine, piperidine, piperazine or morpholine, which is unsubstituted or mono- or disubstituted by A and/or ═O, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 11. A compound according to claim 1, in which R¹ denotes H or A, R² denotes an unsaturated or aromatic 5- or 6-membered heterocycle having 1 to 4 N and/or O atoms, which is unsubstituted or mono-, di- or trisubstituted by Hal, A, [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ and/or O[C(R³)₂]_(n)Het, R³ denotes H, methyl, ethyl or propyl, R⁴, R⁴′ denote H, Het denotes a monocyclic saturated, unsaturated or aromatic heterocycle having 1 to 4 N, O and/or S atoms, which is unsubstituted or mono-, di- or trisubstituted by A and/or [C(R³)₂]_(n)Het¹, Het¹ denotes a monocyclic saturated heterocycle having 1 to 2 N and/or O atoms, which are optionally mono- or disubstituted by A and/or ═O, A denotes unbranched or branched alkyl having 1-8 C atoms, in which 1-7 H atoms are optionally replaced by F, or cyclic alkyl having 3-7 C atoms, Hal denotes F, Cl, Br or I, and n denotes 0, 1, 2, 3 or 4, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 12. A compound according to claim 1, in which R¹ denotes H or A, R² denotes furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl or thiadiazolyl, which is monosubstituted by Hal, A, [C(R³)₂]_(n)N(R³)₂, [C(R³)₂]_(n)Het, O[C(R³)₂]_(n)N(R³)₂ or O[C(R³)₂]_(n)Het, R³ denotes H, methyl, ethyl or propyl, R⁴, R⁴′ denote H, Het denotes piperidinyl, piperazinyl, pyrrolidinyl, morpholinyl, furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrimidinyl, triazolyl, tetrazolyl, oxadiazolyl, thiadiazolyl, pyridazinyl or pyrazinyl, which is monosubstituted by A or [C(R³)₂]_(n)Het¹, Het¹ denotes pyrrolidine, piperidine, piperazine or morpholine, which is unsubstituted or mono- or disubstituted by A and/or ═O, A denotes unbranched or branched alkyl having 1-8 C atoms, in which 1-7 H atoms are optionally replaced by F, or cyclic alkyl having 3-7 C atoms, Hal denotes F, Cl, Br or I, and n denotes 0, 1, 2, 3 or 4, or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 13. A compound, which is one of the following compounds No. Name and/or structure “A1” 2-[3-(5-Bromopyrimidin-2-yl)benzyl]-6-cyclopropyl-2H- pyridazin-3-one “A2” 6-Cyclopropyl-2-(3-{5-[1-(2-pyrrolidin-1-ylethyl)-1H-pyrazol-4- yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one “A3” 6-Cyclopropyl-2-(3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4- yl]pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one “A4” 6-Cyclopropyl-2-[3-(5-methylpyrimidin-2-yl)benzyl]-2H- pyridazin-3-one “A5” 6-Cyclopropyl-2-{3-[5-(1-piperidin-4-yl-1H-pyrazol-4-yl)- pyrimidin-2-yl]benzyl}-2H-pyridazin-3-one “A6” 6-Methyl-2-{3-[5-(1-piperidin-4-yl-1H-pyrazol-4-yl)pyrimidin-2- yl]benzyl}-2H-pyridazin-3-one “A7” 6-Cyclopropyl-2-[3-(5-methyl-1,2,4-oxadiazol-3-yl)benzyl]-2H- pyridazin-3-one “A8” 6-Cyclopropyl-2-{3-[5-(3-dimethylaminopropoxy)pyrimidin-2- yl]-benzyl}-2H-pyridazin-3-one “A9” 6-Cyclopropyl-2-{3-[5-(1-methylpiperidin-4-yloxy)pyrimidin-2- yl]benzyl}-2H-pyridazin-3-one “A10” 2-{3-[5-(3-Dimethylaminopropoxy)pyrimidin-2-yl]benzyl}-6- isopropyl-2H-pyridazin-3-one “A11” 6-Cyclopropyl-2-{3-[5-(piperidin-4-yloxy)pyrimidin-2- yl]benzyl}-2H-pyridazin-3-one “A12” 6-Cyclopropyl-2-{3-[5-(4-methylpiperazin-1-yl)pyrimidin-2-yl]- benzyl}-2H-pyridazin-3-one “A13” 6-Isopropyl-2-(3-{5-[1-(2-morpholin-4-ylethyl)-1H-pyrazol-4- yl]-pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one “A14” 2-(3-{5-[1-(2-Morpholin-4-ylethyl)-1H-pyrazol-4-yl]pyrimidin- 2-yl}benzyl)-2H-pyridazin-3-one “A15” 6-Cyclobutyl-2-(3-{5-[1-(2-pyrrolidin-1-ylethyl)-1H-pyrazol-4- yl]-pyrimidin-2-yl}benzyl)-2H-pyridazin-3-one “A16” 6-Cyclobutyl-2-{3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]- benzyl}-2H-pyridazin-3-one “A17” 6-Cyclopropyl-2-{3-[5-(2-morpholin-4-ylethoxy)pyrimidin-2-yl]- benzyl}-2H-pyridazin-3-one “A18” 2-[3-(5-Aminopyrimidin-2-yl)benzyl]-6-cyclopropyl-2H- pyridazin-3-one

or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof.
 14. A process for preparing a compound of formula I according to claim 1 or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof, comprising reacting a compound of formula II

in which R¹ has the meaning indicated for the compound of formula I, with a compound of formula III

in which R², R³, R⁴ and R⁴′ have the meanings indicated for the compound of formula I and L denotes Cl, Br, I or a free or reactively functionally modified OH group, and/or converting a base or acid of a compound of formula I into one of its salts.
 15. A pharmaceutical composition comprising at least one compound of formula I according to claim 1 and/or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof, and one or more pharmaceutically acceptable excipients and/or adjuvants. 